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Table 1 Baseline characteristics of the enrolled participants by vitamin D status

From: Vitamin D status and obesity markers in older adults: results from West China Health and Aging Trends study

Variables   Total (n = 2661) Vitamin D < 20 ng/ml (n = 1677) Vitamin D 20 - 29ng/ml (n = 846) Vitamin D ≥ 30ng/ml (n = 138) P-value
Age (years)   67.7 ± 6.0 67.8 ± 6.0 67.0 ± 5.7 67.6 ± 6.5 < 0.001
Gender
 Males (n, %)   1090 (41.0) 526 (31.4) 472 (55.8) 92 (66.7) < 0.001
 Females (n, %)   1571 (59.0) 1151 (68.6) 374 (44.2) 46 (33.3)  
Ethnics (n, %) Han 1146 (43.1) 641 (38.2) 426 (50.4) 79 (57.2) < 0.001
Zang 633 (23.8) 452 (27.0) 152 (18.0) 29 (21)  
Qiang 696 (26.2) 482 (28.7) 190 (22.5) 24 (17.4)  
Others 186 (7.0) 102 (6.1) 78 (9.2) 6 (4.3)  
Smoking history (n, %) Yes 484 (19.2) 237 (15.0) 210 (26.0) 37 (27.8) < 0.001
Drinking history (n, %) Yes 677 (26.9) 379 (24.0) 250 (31.0) 48 (36.1) < 0.001
Educational level (n, %) Illiteracy 936 (35.2) 648 (38.6) 255 (30.1) 33 (23.9) < 0.001
Primary school 1338 (50.3) 788 (47.0) 465 (55.0) 85 (61.6)  
High or secondary school 208 (7.8) 123 (7.3) 71 (8.4) 14 (10.1)  
Graduate or above 179 (6.7) 118 (7.0) 55 (6.5) 6 (4.3)  
Marital status (n, %) Single 649 (24.4) 464 (27.7) 158 (18.7) 27 (19.6) < 0.001
Altitude (n, %) 0 - 999 394 (14.8) 171 (10.2) 176 (20.8) 47 (34.1) < 0.001
1000 - 999 1319 (49.6) 860 (21.3) 416 (49.2) 43 (31.2)  
≥ 2000 948 (35.6) 646 (38.5) 254 (30.0) 48 (34.8)  
Number of chronic diseases (n, %) 0 1383 (52.0) 74 (48.1) 1235 (52.1) 74 (53.6) 0.444
1 613 (23.0) 32 (20.8) 552 (23.3) 29 (21.0)  
≥ 2 665 (25.0) 48 (31.2) 582 (24.6) 35 (25.4)  
Physical activity Regular physical activity 1893 (75.2) 108 (76.1) 1673 (74.6) 112 (84.2) 0.043
Less physical activity 625 (24.8) 34 (23.9) 570 (25.4) 21 (15.8)