From: Association between halitosis and female fecundability in China: a prospective cohort study
 | Halitosis N = 342 | Non – halitosis N = 3573 |
---|---|---|
Ethnicity | ||
 Han | 337 (98.5) | 3535 (98.9) |
 Others | 5 (1.5) | 38 (1.1) |
Age at preconception care (years) | ||
  < 25 | 45 (13.2) | 409 (11.5) |
 25–29 | 181 (52.9) | 2083 (58.3) |
 30–34 | 106 (31.0) | 952 (26.6) |
 35–39 | 10 (3.0) | 111 (3.1) |
  ≥ 40 | 0 (0.0) | 18 (0.5) |
Educational level (years) | ||
  ≤ 9 | 13 (3.8) | 114 (3.2) |
 10–12 | 41 (12.0) | 367 (10.3) |
 13–16 | 268 (78.4) | 2730 (76.4) |
  ≥ 17 | 20 (5.9) | 362 (10.1) |
Occupation | ||
 Teachers, civil servants and businessmen | 161 (47.1) | 1791 (50.1) |
 Farmers, workers and waiter | 43 (12.6) | 486 (13.6) |
 Housework or others | 138 (40.4) | 1296 (36.3) |
BMI at preconception care (kg/m2)a | ||
  < 18.5 | 73 (21.4) | 676 (18.9) |
 18.5–24.9 | 240 (70.2) | 2622 (73.4) |
 25–29.9 | 23 (6.7) | 220 (6.2) |
  ≥ 30 | 1 (0.3) | 38 (1.1) |
 Unknown | 5 (1.5) | 17 (0.5) |
Smoking status | ||
 Never | 329 (96.2) | 3542 (99.1) |
 Yes | 13 (3.8) | 30 (0.8) |
 Unknown | 0 (0.0) | 1 (0.03) |
Alcohol consumption | ||
 Never | 246 (71.9) | 2859 (80.0) |
 Occasionally | 91 (26.6) | 689 (19.3) |
 Frequently | 5 (1.5) | 19 (0.5) |
 Unknown | 0 (0.0) | 6 (0.2) |
Dislike to eat vegetables | ||
 No | 319 (93.3) | 3462 (96.9) |
 Yes | 23 (6.7) | 111 (3.1) |
Like to eat raw meat | ||
 No | 316 (92.4) | 3453 (96.6) |
 Yes | 26 (7.6) | 120 (3.4) |
Perceived life or work-related stress | ||
 No | 58 (17.0) | 917 (25.7) |
 Yes | 284 (83.0) | 2656 (74.3) |
Tension with relatives, friends or colleagues | ||
 No | 222 (64.9) | 2830 (79.2) |
 Yes | 120 (35.1) | 743 (20.8) |
Feeling of financial pressure | ||
 No | 136 (39.8) | 1848 (51.7) |
 Yes | 206 (60.2) | 1725 (48.3) |
Medical historyb | ||
 No | 272 (79.5) | 3093 (86.6) |
 Yes | 70 (20.5) | 480 (13.4) |
Gingival bleeding | ||
 No | 105 (40.7) | 2239 (62.7) |
 Yes | 178 (52.0) | 892 (25.0) |
 Unknown | 59 (17.3) | 442 (12.4) |
Time-to-pregnancy [observation period = 12 months; Median (p25, p75)] | ||
 | 6 (3, 12) | 6 (2, 12) |
Time-to-pregnancy [observation period = 24 months; Median (p25, p75)] | ||
 | 6 (3, 18) | 6 (3, 12) |