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Table 1 Demographics and key variables in study population

From: Alcohol drinking as a mediator of the influence of smoking prevalence on second-hand smoke exposure in workplaces: a mediation analysis

Demographics Male (n,%) Female (n,%) Overall (n, %)
Age
 16–29 2641 (41.2) 3587 (46.1) 6228 (43.9)
 30–39 2704 (42.2) 3228 (41.5) 5932 (41.8)
 40–49 876 (13.7) 918 (11.8) 1794 (12.6)
 50 and above 187 (2.9) 54 (0.7) 241 (1.7)
 Mean age (SD) 31.72 ± 7.32 31.49 ± 7.23 31.60 ± 7.27
Marriage
 Single 2409 (37.6) 3125 (40.1) 5534 (39.0)
 Married 3939 (61.5) 4552 (58.5) 8491 (59.8)
 Divorced or widowed 60 (0.9) 110 (1.4) 170 (1.2)
Ethnicity
 Han 6157 (96.1) 7437 (95.5) 13,594 (95.8)
 Others 251 (3.9) 350 (4.5) 601 (4.2)
Education attainment
 Middle school or lower 233 (3.6) 243 (3.1) 476 (3.4)
 High school 1005 (15.7) 1075 (13.8) 2080 (14.7)
 College 4572 (71.3) 5802 (74.5) 10,374 (73.1)
 Master and above 598 (9.3) 667 (8.6) 1265 (8.9)
2017-year income
 100 K or below 3434 (53.6) 5087 (65.3) 8521 (60.0)
 100 K–150 K 1237 (19.3) 1383 (17.8) 2620 (18.5)
 150 K–200 K 632 (9.9) 553 (7.1) 1185 (8.3)
 200 K–300 K 592 (9.2) 421 (5.4) 1013 (7.1)
 300 K or above 513 (8.0) 343 (4.4) 856 (6.0)
Secondhand smoke exposure
 Never 2362 (36.9) 4067 (52.2) 6429 (45.3)
 1 to 3 days per week 2059 (32.1) 2364 (30.4) 4423 (31.2)
 4 to 6 days per week 539 (8.4) 442 (5.7) 981 (6.9)
 Every day 1448 (22.6) 914 (11.7) 2362 (16.6)
BMI
  < 18.5 (underweight) 336 (5.2) 1284 (16.5) 1620 (11.4)
 18.5–24.9 (normal weight) 4138 (64.6) 5084 (65.3) 9222 (65.0)
  ≥ 25.0 (overweight and obesity) 1934 (30.2) 1419 (18.2) 3353 (23.6)
Workplace SF policy
 Yes 4514 (70.4) 5664 (72.7) 10,178 (71.7)
 No 1894 (29.6) 2123 (27.3) 4017 (28.3)
Smoking
 Yes 2593 (40.5) 362 (4.6) 2955 (20.8)
 No 3815 (59.5) 7425 (95.4) 11,240 (79.2)
No. of cigarettes smoked per day
 1–9 467 (28.1) 82 (63.1) 549 (30.7)
 10–19 799 (48.1) 39 (30.0) 838 (46.8)
 20 and above 395 (23.8) 9 (6.9) 404 (22.6)
 Mean age (SD) 12.66 ± 6.81 8.25 ± 6.58 12.34 ± 6.88
Smoking quitting intention
 Yes 1114 (67.1) 87 (66.9) 1201 (67.1)
 No 547 (32.9) 43 (33.1) 590 (32.9)
Alcohol drinking
 Yes 4499 (70.2) 2846 (36.5) 7345 (51.7)
 No 1909 (29.8) 4941 (63.5) 6850 (48.3)
Job position
 Not administrative 3906 (61.0) 5552 (71.3) 9458 (66.6)
 Administrative 2502 (39.0) 2235 (28.7) 4737 (33.4)
Night-shift duty
 Yes 1628 (25.4) 1323 (17.0) 2951 (20.8)
 No 4780 (74.6) 6464 (83.0) 11,244 (79.2)
Chronic disease
 Yes 1924 (30.0) 1965 (25.2) 3889 (27.4)
 No 4484 (70.0) 5822 (74.8) 10,306 (72.6)
Total 6408 (45.1) 7787 (54.9) 14,195 (100)
  1. Note: **p < 0.01
  2. Model controlled for age, ethnic, BMI, marriage, education attainment, yearly income, chronic disease, sleep duration, position and night-shift duty