FA-64766 / Clinical triage scoring / Open access
Inpatient fall risk score: gait weighting · case 01
A weak gait scores the same 20 points as an impaired gait.
ROOT CAUSE
Weak and impaired gait share one weight.
THE FAILURE
Weak and impaired gait share one weight.
Unsuccessful approach: Scoring both at 10 under-weights impaired gait.
Case contract
Input {last_fall_days (or null), secondary_dx, aid, iv, gait, mental}. Toy points: a fall within the last 90 days (inclusive) 25; secondary diagnosis 15; aid none/bedrest/nurse 0, crutches/cane/walker 15, furniture 30; IV access 20; gait normal/bedrest/immobile 0, weak 10, impaired 20; mental status "forgets" or "overestimates" (overestimates own ability) 15, "oriented" 0. Risk: 0-24 LOW, 25-44 MODERATE, >= 45 HIGH. Return {score, risk}.
Why this case matters
Nursing risk scores map categorical observations to weighted points; recency windows, category tables and band edges fail independently.
1 / The failure
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(x):
d = x['last_fall_days']
fell = d is not None and d <= 90
s = 25 if fell else 0
s += 15 if x['secondary_dx'] else 0
aid = x['aid']
s += 30 if aid == 'furniture' else 15 if aid in ('crutches', 'cane', 'walker') else 0
s += 20 if x['iv'] else 0
g = x['gait']
s += 20 if g in ('impaired', 'weak') else 0
s += 15 if x['mental'] in ('forgets', 'overestimates') else 0
risk = 'HIGH' if s >= 45 else 'MODERATE' if s >= 25 else 'LOW'
return {'score': s, 'risk': risk}
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('no risk factors',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 0, 'risk': 'LOW'}),
('fall exactly 90 days ago',
{'last_fall_days': 90,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('fall a year ago',
{'last_fall_days': 301,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 20, 'risk': 'LOW'}),
('furniture walking',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'furniture',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('walker user',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'normal',
'mental': 'forgets'},
{'score': 45, 'risk': 'HIGH'}),
('weak gait',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'cane',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'}),
('impaired gait',
{'last_fall_days': 10,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'impaired',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('score exactly 40',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'cane',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('overestimates own ability',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'overestimates'},
{'score': 30, 'risk': 'MODERATE'}),
('score exactly 25',
{'last_fall_days': 31,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('score exactly 45',
{'last_fall_days': 6,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'})],
[('no risk factors',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'bedrest',
'mental': 'oriented'},
{'score': 0, 'risk': 'LOW'}),
('fall exactly 90 days ago',
{'last_fall_days': 90,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('fall a year ago',
{'last_fall_days': 302,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 20, 'risk': 'LOW'}),
('furniture walking',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'furniture',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('walker user',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 30, 'risk': 'MODERATE'}),
('weak gait',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'cane',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'}),
('impaired gait',
{'last_fall_days': 20,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'impaired',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('score exactly 40',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('overestimates own ability',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'overestimates'},
{'score': 50, 'risk': 'HIGH'}),
('score exactly 25',
{'last_fall_days': 32,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('score exactly 45',
{'last_fall_days': 7,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'})],
[('no risk factors',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'immobile',
'mental': 'oriented'},
{'score': 0, 'risk': 'LOW'}),
('fall exactly 90 days ago',
{'last_fall_days': 90,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('fall a year ago',
{'last_fall_days': 303,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 20, 'risk': 'LOW'}),
('furniture walking',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'furniture',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('walker user',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'normal',
'mental': 'forgets'},
{'score': 45, 'risk': 'HIGH'}),
('weak gait',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'cane',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'}),
('impaired gait',
{'last_fall_days': 30,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'impaired',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('score exactly 40',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'crutches',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('overestimates own ability',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'overestimates'},
{'score': 30, 'risk': 'MODERATE'}),
('score exactly 25',
{'last_fall_days': 33,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('score exactly 45',
{'last_fall_days': 8,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'})],
[('no risk factors',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 0, 'risk': 'LOW'}),
('fall exactly 90 days ago',
{'last_fall_days': 90,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('fall a year ago',
{'last_fall_days': 304,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 20, 'risk': 'LOW'}),
('furniture walking',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'furniture',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('walker user',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 30, 'risk': 'MODERATE'}),
('weak gait',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'cane',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'}),
('impaired gait',
{'last_fall_days': 40,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'impaired',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('score exactly 40',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'cane',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('overestimates own ability',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'overestimates'},
{'score': 50, 'risk': 'HIGH'}),
('score exactly 25',
{'last_fall_days': 34,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('score exactly 45',
{'last_fall_days': 9,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'})],
[('no risk factors',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'bedrest',
'mental': 'oriented'},
{'score': 0, 'risk': 'LOW'}),
('fall exactly 90 days ago',
{'last_fall_days': 90,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('fall a year ago',
{'last_fall_days': 305,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 20, 'risk': 'LOW'}),
('furniture walking',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'furniture',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('walker user',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'normal',
'mental': 'forgets'},
{'score': 45, 'risk': 'HIGH'}),
('weak gait',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'cane',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'}),
('impaired gait',
{'last_fall_days': 50,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'impaired',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('score exactly 40',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('overestimates own ability',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'overestimates'},
{'score': 30, 'risk': 'MODERATE'}),
('score exactly 25',
{'last_fall_days': 35,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('score exactly 45',
{'last_fall_days': 10,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'})]]
for label, args, expected in fixtures[N-1]:
check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| no risk factors | {'risk': 'LOW', 'score': 0} | {'risk': 'LOW', 'score': 0} | Passed |
| fall exactly 90 days ago | {'risk': 'MODERATE', 'score': 40} | {'risk': 'MODERATE', 'score': 40} | Passed |
| fall a year ago | {'risk': 'LOW', 'score': 20} | {'risk': 'LOW', 'score': 20} | Passed |
| furniture walking | {'risk': 'HIGH', 'score': 50} | {'risk': 'MODERATE', 'score': 40} | Failed |
| walker user | {'risk': 'HIGH', 'score': 45} | {'risk': 'HIGH', 'score': 45} | Passed |
| weak gait | {'risk': 'HIGH', 'score': 55} | {'risk': 'HIGH', 'score': 45} | Failed |
| impaired gait | {'risk': 'HIGH', 'score': 60} | {'risk': 'HIGH', 'score': 60} | Passed |
| score exactly 40 | {'risk': 'HIGH', 'score': 50} | {'risk': 'MODERATE', 'score': 40} | Failed |
| overestimates own ability | {'risk': 'MODERATE', 'score': 30} | {'risk': 'MODERATE', 'score': 30} | Passed |
| score exactly 25 | {'risk': 'MODERATE', 'score': 25} | {'risk': 'MODERATE', 'score': 25} | Passed |
| score exactly 45 | {'risk': 'HIGH', 'score': 45} | {'risk': 'HIGH', 'score': 45} | Passed |
SHA-256 / 5dded7b928fd65a748daf064167c8f55ac1fb317ff543a1f2a8a77abfc0f17f6
2 / The unsuccessful fix
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(x):
d = x['last_fall_days']
fell = d is not None and d <= 90
s = 25 if fell else 0
s += 15 if x['secondary_dx'] else 0
aid = x['aid']
s += 30 if aid == 'furniture' else 15 if aid in ('crutches', 'cane', 'walker') else 0
s += 20 if x['iv'] else 0
g = x['gait']
s += 10 if g in ('impaired', 'weak') else 0
s += 15 if x['mental'] in ('forgets', 'overestimates') else 0
risk = 'HIGH' if s >= 45 else 'MODERATE' if s >= 25 else 'LOW'
return {'score': s, 'risk': risk}
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
fixtures = [[('no risk factors',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 0, 'risk': 'LOW'}),
('fall exactly 90 days ago',
{'last_fall_days': 90,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('fall a year ago',
{'last_fall_days': 301,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 20, 'risk': 'LOW'}),
('furniture walking',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'furniture',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('walker user',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'normal',
'mental': 'forgets'},
{'score': 45, 'risk': 'HIGH'}),
('weak gait',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'cane',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'}),
('impaired gait',
{'last_fall_days': 10,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'impaired',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('score exactly 40',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'cane',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('overestimates own ability',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'overestimates'},
{'score': 30, 'risk': 'MODERATE'}),
('score exactly 25',
{'last_fall_days': 31,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('score exactly 45',
{'last_fall_days': 6,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'})],
[('no risk factors',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'bedrest',
'mental': 'oriented'},
{'score': 0, 'risk': 'LOW'}),
('fall exactly 90 days ago',
{'last_fall_days': 90,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('fall a year ago',
{'last_fall_days': 302,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 20, 'risk': 'LOW'}),
('furniture walking',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'furniture',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('walker user',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 30, 'risk': 'MODERATE'}),
('weak gait',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'cane',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'}),
('impaired gait',
{'last_fall_days': 20,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'impaired',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('score exactly 40',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('overestimates own ability',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'overestimates'},
{'score': 50, 'risk': 'HIGH'}),
('score exactly 25',
{'last_fall_days': 32,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('score exactly 45',
{'last_fall_days': 7,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'})],
[('no risk factors',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'immobile',
'mental': 'oriented'},
{'score': 0, 'risk': 'LOW'}),
('fall exactly 90 days ago',
{'last_fall_days': 90,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('fall a year ago',
{'last_fall_days': 303,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 20, 'risk': 'LOW'}),
('furniture walking',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'furniture',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('walker user',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'normal',
'mental': 'forgets'},
{'score': 45, 'risk': 'HIGH'}),
('weak gait',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'cane',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'}),
('impaired gait',
{'last_fall_days': 30,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'impaired',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('score exactly 40',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'crutches',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('overestimates own ability',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'overestimates'},
{'score': 30, 'risk': 'MODERATE'}),
('score exactly 25',
{'last_fall_days': 33,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('score exactly 45',
{'last_fall_days': 8,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'})],
[('no risk factors',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 0, 'risk': 'LOW'}),
('fall exactly 90 days ago',
{'last_fall_days': 90,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('fall a year ago',
{'last_fall_days': 304,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 20, 'risk': 'LOW'}),
('furniture walking',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'furniture',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('walker user',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 30, 'risk': 'MODERATE'}),
('weak gait',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'cane',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'}),
('impaired gait',
{'last_fall_days': 40,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'impaired',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('score exactly 40',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'cane',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('overestimates own ability',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'overestimates'},
{'score': 50, 'risk': 'HIGH'}),
('score exactly 25',
{'last_fall_days': 34,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('score exactly 45',
{'last_fall_days': 9,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'})],
[('no risk factors',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'bedrest',
'mental': 'oriented'},
{'score': 0, 'risk': 'LOW'}),
('fall exactly 90 days ago',
{'last_fall_days': 90,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('fall a year ago',
{'last_fall_days': 305,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 20, 'risk': 'LOW'}),
('furniture walking',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'furniture',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('walker user',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'normal',
'mental': 'forgets'},
{'score': 45, 'risk': 'HIGH'}),
('weak gait',
{'last_fall_days': None,
'secondary_dx': False,
'aid': 'cane',
'iv': True,
'gait': 'weak',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'}),
('impaired gait',
{'last_fall_days': 50,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'impaired',
'mental': 'oriented'},
{'score': 60, 'risk': 'HIGH'}),
('score exactly 40',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'walker',
'iv': False,
'gait': 'weak',
'mental': 'oriented'},
{'score': 40, 'risk': 'MODERATE'}),
('overestimates own ability',
{'last_fall_days': None,
'secondary_dx': True,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'overestimates'},
{'score': 30, 'risk': 'MODERATE'}),
('score exactly 25',
{'last_fall_days': 35,
'secondary_dx': False,
'aid': 'none',
'iv': False,
'gait': 'normal',
'mental': 'oriented'},
{'score': 25, 'risk': 'MODERATE'}),
('score exactly 45',
{'last_fall_days': 10,
'secondary_dx': False,
'aid': 'none',
'iv': True,
'gait': 'normal',
'mental': 'oriented'},
{'score': 45, 'risk': 'HIGH'})]]
for label, args, expected in fixtures[N-1]:
check(label, solve(args), expected)
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
| Boundary fixture | Actual | Expected | Outcome |
|---|---|---|---|
| no risk factors | {'risk': 'LOW', 'score': 0} | {'risk': 'LOW', 'score': 0} | Passed |
| fall exactly 90 days ago | {'risk': 'MODERATE', 'score': 40} | {'risk': 'MODERATE', 'score': 40} | Passed |
| fall a year ago | {'risk': 'LOW', 'score': 20} | {'risk': 'LOW', 'score': 20} | Passed |
| furniture walking | {'risk': 'MODERATE', 'score': 40} | {'risk': 'MODERATE', 'score': 40} | Passed |
| walker user | {'risk': 'HIGH', 'score': 45} | {'risk': 'HIGH', 'score': 45} | Passed |
| weak gait | {'risk': 'HIGH', 'score': 45} | {'risk': 'HIGH', 'score': 45} | Passed |
| impaired gait | {'risk': 'HIGH', 'score': 50} | {'risk': 'HIGH', 'score': 60} | Failed |
| score exactly 40 | {'risk': 'MODERATE', 'score': 40} | {'risk': 'MODERATE', 'score': 40} | Passed |
| overestimates own ability | {'risk': 'MODERATE', 'score': 30} | {'risk': 'MODERATE', 'score': 30} | Passed |
| score exactly 25 | {'risk': 'MODERATE', 'score': 25} | {'risk': 'MODERATE', 'score': 25} | Passed |
| score exactly 45 | {'risk': 'HIGH', 'score': 45} | {'risk': 'HIGH', 'score': 45} | Passed |
SHA-256 / 0585739e447b4f74d33cd888e67c946c400fe32fceee284e587beb9277cfee9d
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The verified repair and its recorded checks are member-only.
This mechanism has 11 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.
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Sign in to the archive ↗Verification & scope
A deterministic toy software model with explicitly stipulated thresholds and formulas; it is not clinical guidance, not a validated medical calculator, and makes no claim of conformance to any published protocol. Numbered variants vary patient and order inputs. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.
Observations recorded using Python 3.12.14 at 2026-09-29T14:47:27.891132+00:00.
Case digest / 1692c3142589223c12ab91d937e314afb3af1aa9bacb47b6d60b3999cec95bcb