Table 1.
Baseline characteristics of the study population, total and surgery applied
| Total sample (%) | Surgery applied (%) | |||
|---|---|---|---|---|
| (n = 214,601) | (n = 159,173) | |||
| Individual factor | ||||
| Sex | ||||
| Male | 47,456 | (22.1) | 34,904 | (21.9) |
| Female | 167,145 | (77.9) | 124,269 | (78.1) |
| Age Group | ||||
| 65–79 | 57,608 | (26.8) | 44,528 | (28.0) |
| 80–89 | 105,505 | (49.2) | 78,333 | (49.2) |
| Over 90 | 51,488 | (24.0) | 36,312 | (22.8) |
| Dementia Levela | ||||
| 0 | 111,414 | (51.9) | 84,424 | (53.0) |
| 1 | 58,400 | (27.2) | 42,187 | (26.5) |
| 2 | 44,787 | (20.9) | 32,562 | (20.5) |
| Fructure Type | ||||
| Femoral neck | 115,753 | (53.9) | 88,243 | (55.4) |
| Trochanteric | 95,946 | (44.7) | 69,229 | (43.5) |
| Subtrochanteric | 2900 | (1.4) | 1701 | (1.1) |
| Charlson Index | ||||
| 0 | 94,182 | (43.9) | 68,173 | (42.8) |
| 1 | 67,259 | (31.3) | 51,625 | (32.4) |
| ≥ 2 | 53,160 | (24.8) | 39,375 | (24.7) |
| Coma Levelb | ||||
| Alert | 183,672 | (85.6) | 136,161 | (85.5) |
| Level 1 | 29,890 | (13.9) | 22,301 | (14.0) |
| Level 2 | 966 | (0.5) | 668 | (0.4) |
| Level 3 | 73 | (0.03) | 43 | (0.03) |
| Ambulance use | ||||
| No ambulance use | 103,136 | (48.1) | 68,992 | (43.3) |
| Ambulance use | 111,465 | (51.9) | 90,181 | (56.7) |
| Hospital factor | ||||
| City levelc | ||||
| Designated city | 62,667 | (29.2) | 47,388 | (29.8) |
| Population ≥ 150,000 | 70,862 | (33.0) | 54,353 | (34.2) |
| Population 80,000≤, ≤150,000 | 39,173 | (18.3) | 29,661 | (18.6) |
| Population ≤ 80,000 | 41,899 | (19.5) | 27,771 | (17.5) |
| Hospital functiond | ||||
| University & advanced hospitals | 5288 | (2.5) | 4263 | (2.7) |
| Regional support hospital | 52,802 | (24.6) | 44,825 | (28.2) |
| Over 200 beds hospital | 117,215 | (54.6) | 91,272 | (57.3) |
| Under 200 beds hospital | 39,296 | (18.3) | 18,813 | (11.8) |
| Length of stay factor | ||||
| Discharge to | ||||
| Home | 58,673 | (27.3) | 32,873 | (20.7) |
| Recovery ward (same hosp.) | 6318 | (2.9) | 3255 | (2.04) |
| Other hospital | 108,323 | (50.5) | 93,681 | (58.9) |
| Long-term care facility | 38,337 | (17.9) | 27,584 | (17.3) |
| Death | 2679 | (1.3) | 1605 | (1.0) |
| Unknown | 264 | (0.1) | 168 | (0.1) |
aDementia level 1 and 2: represents “degree of independence in daily life for elderly people with dementia” criteria I-II and III-IV/M, respectively. bComa level refers to the Japan Coma Scale (JCS) which has four decisive levels of consciousness. cDesignated city has population over 500,000 and is designated by order of the Cabinet of Japan under Local Autonomy Law. dAdvanced hospitals include 6 national centers for cancer, circulation and global health. Regional support hospital has over 200 beds and meets requirements such as referral rate over 80% for outpatients