Table 1 Descriptive baseline data of participants according to BMI and lower extremity performance
Variables | Low weight (BMI < 23.0) | Normal weight (BMI 23.0–24.9) | Overweight (BMI 25.0–29.9) | Obese (BMI ≥30.0) | P | Intact LEP (SPPB 10–12) | Impaired LEP (SPPB 0–9) | P |
|---|---|---|---|---|---|---|---|---|
n = 156 | n = 166 | n = 375 | n = 126 | n = 523 | n = 300 | |||
Characteristics | ||||||||
 Age (year), M ± SD | 81.2 ± 4.3 | 79.9 ± 4.2 | 80.0 ± 4.3 | 79.4 ± 4.1 | .003 a | 79.7 ± 4.2 | 80.8 ± 4.3 | <.001 a |
 Women, n (%) | 100 (64.1%) | 88 (53.0%) | 226 (60.3%) | 97 (77.0%) | <.001 b | 318 (60.8%) | 193 (64.3%) | .315 b |
 Height (cm), M ± SD | 163.8 ± 9.0 | 166.7 ± 9.0 | 164.9 ± 9.0 | 162.4 ± 7.7 | <.001 a | 165.0 ± 8.4 | 164.0 ± 9.7 | .104 a |
 Body weight (kg), M ± SD | 56.8 ± 8.3 | 66.9 ± 7.4 | 73.7 ± 8.4 | 86.9 ± 11.0 | <.001 a | 70.8 ± 11.8 | 71.7 ± 13.8 | .317 a |
 BMI (kg/m2), M ± SD | 21.1 ± 1.6 | 24.0 ± 0.5 | 27.0 ± 1.4 | 32.9 ± 2.9 | <.001 a | 26.0 ± 3.8 | 26.6 ± 4.3 | .029 a |
 Chronic diseases (n), Med (IQR) | 4 (4) | 4 (3) | 4 (3) | 4 (3) | .007 c | 4 (3) | 5 (4) | <.001 d |
 Education (year), Med (IQR) | 9 (5) | 9 (5) | 8 (5) | 8 (5) | .060 c | 9 (5) | 8 (4) | <.001 d |
Life-space | ||||||||
 Maximal independent LS (score), Med (IQR) | 4 (2) | 5 (1) | 4 (2) | 4 (4) | .019 c | 5 (1) | 4 (4) | <.001 d |
Short Physical Performance Battery | ||||||||
 Total (score), Med (IQR) | 11.0 (3.0) | 11.0 (3.0) | 10.0 (3.0) | 10.0 (3.0) | .006 c | 11.0 (1.0) | 8.0 .0) | <.001 d |
 Impaired (SPPB 0–9), n (%) | 56 (35.9%) | 48 (28.9%) | 144 (38.4%) | 52 (41.3%) | .113 b | – | – |  |
Use of a private car, n (%) | ||||||||
 Car driver | 51 (32.7%) | 78 (47.0%) | 160 (42.7%) | 37 (29.4%) | .006 b | 246 (47.0%) | 80 (26.7%) | <.001 b |
 Private car passenger | 77 (49.4%) | 66 (39.8%) | 165 (44.0%) | 75 (59.5%) |  | 216 (41.3%) | 167 (55.7%) |  |
 No use of a private car | 28 (17.9%) | 22 (13.3%) | 50 (13.3%) | 14 (11.1%) |  | 61 (11.7%) | 53 (17.7%) |  |