Table 1.
Baseline characteristics of the elderly adults, a cohort study in China, 2005-2019
| Variables | Sleep duration | P value | ||
|---|---|---|---|---|
| Short (≤ 6h), n=1,803 | Moderate (7-8h), n=7,459 | Long (> 8h), n=5,830 | ||
| Age at baseline, years | <0.0001 | |||
| Mean ± SD | 88.49 ± 11.12 | 87.07 ± 12.08 | 92.31 ± 10.26 | |
| Categories, n(%) | <0.0001 | |||
| <80 years | 381 (21.13) | 1999 (26.80) | 693 (11.89) | |
| 80-89 years | 509 (28.23) | 1888 (25.31) | 1214 (20.82) | |
| 90-99 years | 522 (28.95) | 2041 (27.36) | 1939 (33.26) | |
| ≥100 years | 391 (21.69) | 1531 (20.53) | 1984 (34.03) | |
| Sex, n(%) | <0.0001 | |||
| Male | 662 (36.72) | 3198 (42.87) | 2255 (38.68) | |
| Female | 1141 (63.28) | 4261 (57.13) | 3575 (61.32) | |
| Residence, n(%) | 0.0035 | |||
| City | 328 (18.19) | 1282 (17.19) | 987 (16.93) | |
| Town | 297 (16.47) | 1383 (18.54) | 959 (16.45) | |
| Rural area | 1178 (65.34) | 4794 (64.27) | 3884 (66.62) | |
| Ethic, n(%)a | 0.0602 | |||
| Han | 1696 (95.71) | 6923 (95.14) | 5367 (95.82) | |
| Others | 76 (4.29) | 354 (4.86) | 234 (4.18) | |
| Marriage status, n(%)a | <0.0001 | |||
| Married | 1276 (70.81) | 4898 (65.78) | 4587 (78.71) | |
| Others | 526 (29.19) | 2548 (34.22) | 1241 (21.29) | |
| Occupation, n(%)a | <0.0001 | |||
| Farmer or manual | 1451 (80.97) | 5805 (78.37) | 4775 (82.41) | |
| Clerical | 198 (11.05) | 821 (11.08) | 520 (8.97) | |
| Professional | 65 (3.63) | 469 (6.33) | 222 (3.83) | |
| Others | 78 (4.35) | 312 (4.21) | 277 (4.78) | |
| Education, n(%)a | <0.0001 | |||
| Illiterate | 1253 (70.31) | 4774 (64.34) | 4140 (71.40) | |
| Primary school | 404 (22.67) | 1929 (26.00) | 1317 (22.71) | |
| Middle school or above | 125 (7.01) | 717 (9.66) | 341 (5.88) | |
| Access to medical service, n(%)a | 0.0059 | |||
| Yes | 1531 (84.91) | 6807 (91.28) | 5412 (92.86) | |
| No | 272 (15.09) | 650 (8.72) | 416 (7.14) | |
| Smoking status, n(%)a | 0.0019 | |||
| Never | 1279 (70.98) | 5169 (69.38) | 4116 (70.70) | |
| Ever smoker | 222 (12.32) | 882 (11.84) | 778 (13.36) | |
| Current smoker | 301 (16.70) | 1399 (18.78) | 928 (15.94) | |
| Drinking status, n(%)a | 0.0019 | |||
| Never | 1323 (73.46) | 5373 (72.18) | 4154 (71.42) | |
| Ever drinker | 188 (10.44) | 659 (8.85) | 606 (10.42) | |
| Current drinker | 290 (16.10) | 1412 (18.97) | 1056 (18.16) | |
| Exercise status, n(%)a | <0.0001 | |||
| Never | 1216 (67.52) | 5120 (69.02) | 4148 (71.36) | |
| Ever exerciser | 182 (10.11) | 421 (5.68) | 461 (7.93) | |
| Current exerciser | 403 (22.38) | 1877 (25.30) | 1204 (20.71) | |
| ADL score, n(%)a | <0.0001 | |||
| 6 | 1350 (75.33) | 6005 (80.77) | 3838 (66.01) | |
| 5 | 143 (7.98) | 587 (7.90) | 752 (12.93) | |
| 3-4 | 103 (5.75) | 350 (4.71) | 493 (8.48) | |
| 0-2 | 196 (10.94) | 493 (6.63) | 731 (12.57) | |
| Physical performance score, n(%)a | <0.0001 | |||
| 5 | 739 (41.42) | 3831 (51.67) | 2143 (36.98) | |
| 2.5-4.5 | 797 (44.67) | 2931 (39.53) | 2787 (48.09) | |
| 0-2.5 | 248 (13.90) | 652 (8.79) | 865 (14.93) | |
| MMSE score, n(%)a | <0.0001 | |||
| 24-30 | 764 (46.59) | 3832 (56.12) | 2078 (39.65) | |
| 18-23 | 281 (17.13) | 1146 (16.78) | 968 (18.47) | |
| 0-17 | 595 (36.28) | 1850 (27.09) | 2195 (41.88) | |
| Food diversity score, n(%)a | <0.0001 | |||
| 6-8 | 547 (30.36) | 3036 (40.77) | 2266 (38.92) | |
| 4-5 | 618 (34.30) | 2500 (33.57) | 2149 (36.91) | |
| 0-3 | 637 (35.35) | 1911 (25.66) | 1407 (24.17) | |
| Social activity score, n(%)a | <0.0001 | |||
| 5-8 | 111 (6.16) | 766 (10.27) | 287 (4.92) | |
| 3-4 | 510 (28.29) | 2602 (34.90) | 1488 (25.53) | |
| 0-2 | 1182 (65.56) | 4088 (54.83) | 4054 (69.55) | |
| Chronic disease score, n(%)a | <0.0001 | |||
| 0 | 828 (50.00) | 3932 (57.38) | 3518 (63.34) | |
| 1-2 | 664 (40.10) | 2321 (33.87) | 1633 (29.40) | |
| ≥3 | 164 (9.90) | 600 (8.76) | 403 (7.26) | |
Abbreviations: ADL activities of daily living, IQR interquartile range, MMSE Mini-Mental State Examination, SD standard deviation
a Contains missing values. Ethic: 442, marriage status:16, occupation: 99, access to medical service: 4, education:92, smoking status: 18, drinking status: 31, exercise status: 60, ADL score: 51, physical performance score: 99, MMSE score: 1,383, food diversity score: 21, social activity score: 4, chronic disease score: 1,029
P values were derived from the ANOVA for continuous variables or the Chi-square test for categorical variables