Table 1.
Characteristics of 958 participants according to two subsamples.
| Characteristics | Total sample(N=958) | Training set(N=479) | Validation set(N=479) | P-value |
|---|---|---|---|---|
| PSQI-7 score | 8.44 ± 3.09 | 8.27 ± 3.08 | 8.61 ± 3.11 | 0.197a |
| Age, mean ± SD | 102.79 ± 2.72 | 102.84 ± 2.89 | 102.76 ± 2.53 | 0.660b |
| BMI, mean ± SD | 18.94 ± 3.63 | 18.86 ± 3.58 | 19.06 ± 3.68 | 0.453a |
| Female, n (%) | 784(81.84%) | 398(83.09%) | 386(80.58%) | 0.315c |
| Han ethnic, n (%) | 847(88.41%) | 422(88.10%) | 425(88.73%) | 0.762c |
| Illiterate, n (%) | 873(91.13%) | 441(92.07%) | 432(90.19%) | 0.364c |
| Rural, n (%) | 629(65.66%) | 314(65.55%) | 315(65.76%) | 0.954c |
| Divorced or widowed, n (%) | 861(89.87%) | 428(89.35%) | 433(90.39%) | 0.669c |
| Living with families, n (%) | 822(85.80%) | 414(86.43%) | 408(85.18%) | 0.172c |
| SWLS score | 21.80 ± 7.25 | 22.25 ± 7.03 | 21.35 ± 7.44 | 0.025b |
| ADL score | 74.69 ± 25.19 | 75.16 ± 25.09 | 74.23 ± 25.32 | 0.436b |
| GDS-15 score | 5.28 ± 3.14 | 5.21 ± 3.09 | 5.37 ± 3.19 | 0.459b |
| VAS score | 60.22 ± 17.94 | 61.39 ± 17.19 | 59.05 ± 18.62 | 0.044b |
SD, standard deviation; BMI, body mass index; SWLS, Satisfaction with Life Scale; ADL, activity of daily living; VAS, Visual Analog Scale; GDS-15, the 15-item geriatric depression scale; PSQI, Pittsburgh Sleep Quality Index.
a
Student’s t test.
b
Wilcoxon rank-sum test.
c
Chi-squared test.