TABLE 2.
Baseline characteristics of male never‐smokers by categories of annual BMI changes, Kailuan cohort, 2006–2015
| Characteristics | Annual BMI changes (kg/m2/year) a | p b | ||||
|---|---|---|---|---|---|---|
| Major loss | Minor loss | Stable | Minor gain | Major gain | ||
| No. | 2481 | 13,007 | 6142 | 13,253 | 2202 | |
| Age (years), mean (SD) | 52.28 ± 12.98 | 51.47 ± 12.25 | 51.10 ± 12.37 | 50.93 ± 13.07 | 51.57 ± 14.5 | <0.001 |
| BMI (kg/m2), No. (%) | <0.001 | |||||
| <18.5 | 3 (0.12) | 50 (0.38) | 62 (1.01) | 253 (1.91) | 109 (4.95) | |
| ≥18.5 and <25.0 | 436 (17.57) | 4908 (37.73) | 2975 (48.44) | 7525 (56.78) | 1437 (65.26) | |
| ≥25.0 and <30.0 | 1353 (54.53) | 6752 (51.91) | 2764 (45.00) | 4825 (36.41) | 572 (25.98) | |
| ≥30.0 | 689 (27.77) | 1297 (9.97) | 341 (5.55) | 650 (4.90) | 84 (3.81) | |
| WC (cm), No. (%) | <0.001 | |||||
| <85 | 639 (25.76) | 4114 (31.63) | 2150 (35.00) | 4953 (37.37) | 855 (38.83) | |
| ≥85 | 1842 (74.24) | 8893 (68.37) | 3992 (65.00) | 8300 (62.63) | 1347 (61.17) | |
| TC (mg/dl), No. (%) | <0.001 | |||||
| <5.2 | 1643 (66.22) | 8402 (64.60) | 3969 (64.62) | 8656 (65.31) | 1542 (70.03) | |
| ≥5.2 | 838 (33.78) | 4605 (35.40) | 2173 (35.38) | 4597 (34.69) | 660 (29.97) | |
| TG (mg/dl), No. (%) | <0.001 | |||||
| <1.7 | 1590 (64.09) | 8539 (65.65) | 4210 (68.54) | 9312 (70.26) | 1567 (71.16) | |
| ≥1.7 | 891 (35.91) | 4468 (34.35) | 1932 (31.46) | 3941 (29.74) | 635 (28.84) | |
| LDL‐C (mg/dl), No. (%) | 0.041 | |||||
| <3.4 | 2217 (89.36) | 11,663 (89.67) | 5574 (90.75) | 11,990 (90.47) | 1972 (89.55) | |
| ≥3.4 | 264 (10.64) | 1344 (10.33) | 568 (9.25) | 1263 (9.53) | 230 (10.45) | |
| Education level, No. (%) | <0.001 | |||||
| Illiterate or primary school | 240 (9.69) | 1151 (8.86) | 476 (7.76) | 1232 (9.31) | 207 (9.43) | |
| Junior high school | 1910 (77.08) | 9760 (75.11) | 4611 (75.16) | 9658 (73.00) | 1608 (73.22) | |
| Senior high school | 222 (8.96) | 1334 (10.27) | 623 (10.15) | 1419 (10.72) | 226 (10.29) | |
| College and above | 106 (4.28) | 749 (5.76) | 425 (6.93) | 922 (6.97) | 155 (7.06) | |
| Income/month (CNY), No. (%) | <0.001 | |||||
| <500 | 359 (14.59) | 2745 (21.21) | 1260 (20.60) | 2636 (19.98) | 251 (11.51) | |
| 500–1000 | 1687 (68.58) | 8638 (66.75) | 4123 (67.40) | 8760 (66.39) | 1440 (66.02) | |
| ≥1000 | 414 (16.83) | 1558 (12.04) | 734 (12.00) | 1798 (13.63) | 490 (22.47) | |
| Alcohol consumption status, No. (%) | <0.001 | |||||
| Never‐ drinker | 2305 (92.91) | 11,663 (89.67) | 5545 (90.28) | 11,915 (89.90) | 2013 (91.42) | |
| Ever drinker | 176 (7.09) | 1344 (10.33) | 597 (9.72) | 1338 (10.10) | 189 (8.58) | |
| Coal dust exposure status, No. (%) | <0.001 | |||||
| Nonexposed | 1090 (43.99) | 4808 (37.01) | 2335 (38.06) | 5432 (41.06) | 1009 (45.95) | |
| Exposure | 1388 (56.01) | 8184 (62.99) | 3800 (61.94) | 7797 (58.94) | 1187 (54.05) | |
| Degree of coal dust exposure, No. (%) | <0.001 | |||||
| Light | 799 (57.56) | 4295 (52.48) | 1957 (51.50) | 4001 (51.31) | 692 (58.30) | |
| Moderate | 229 (16.50) | 1672 (20.43) | 794 (20.89) | 1586 (20.34) | 195 (16.43) | |
| Heavy | 360 (25.94) | 2217 (27.09) | 1049 (27.61) | 2210 (28.34) | 300 (25.27) | |
| Physical activity, No. (%) | 0.007 | |||||
| Never | 221 (8.92) | 1088 (8.37) | 506 (8.25) | 1257 (9.50) | 212 (9.65) | |
| <4 times/week | 1964 (79.26) | 10,273 (79.06) | 4841 (78.91) | 10,321 (78.00) | 1747 (79.48) | |
| ≥4 times/week | 293 (11.82) | 1633 (12.57) | 788 (12.84) | 1654 (12.50) | 239 (10.87) | |
| Dietary fat intake, No. (%) | <0.001 | |||||
| Never | 189 (7.64) | 923 (7.12) | 440 (7.18) | 1037 (7.84) | 184 (8.38) | |
| <3 times/week | 2173 (87.87) | 11,360 (87.57) | 5329 (87.00) | 11,351 (85.87) | 1909 (86.93) | |
| ≥3 times/week | 111 (4.49) | 689 (5.31) | 356 (5.81) | 831 (6.29) | 103 (4.69) | |
Abbreviations: BMI, body mass index; CNY, Chinese yuan; LDL‐C, low‐density lipoprotein cholesterol; TC, total cholesterol; TG, triglycerides; WC, waist circumference.
a
Major loss (<−1.0 kg/m2/year), minor loss (≥−1.0 kg/m2/year and <−0.1 kg/m2/year), stable (≥−0.1 kg/m2/year and <0.1 kg/m2/year), minor gain (≥0.1 kg/m2/year and <1.0 kg/m2/year), major gain (≥1.0 kg/m2/year).
b
p values from chi‐square tests.