Table 1 The characteristics of the study population (n = 678).
Items | Total (n = 678) | Shanghai (221) | Nanjing (206) | Ningxia (251) |
|---|---|---|---|---|
Age (years), n (%) | ||||
18–25 | 159 (23.5) | 46 (20.8) | 32 (15.5) | 81 (32.3) |
26–30 | 204 (30.1) | 43 (19.5) | 90 (43.7) | 71 (28.3) |
31–40 | 188 (27.7) | 82 (37.1) | 63 (30.6) | 43 (17.1) |
41–50 | 100 (14.7) | 39 (17.6) | 21 (10.2) | 40 (15.9) |
51–60 | 22 (3.2) | 10 (4.5) | 0 | 12 (4.8) |
> 60 | 5 (0.7) | 1 (0.5) | 0 | 4 (1.6) |
Job, n (%) | ||||
Student | 119 (17.6) | 32 (14.5) | 26 (12.6) | 61 (24.3) |
Production and sales staff | 221 (32.6) | 59 (26.7) | 89 (43.2) | 73 (29.1) |
Administrative staff | 127 (18.7) | 66 (29.9) | 32 (15.5) | 29 (11.6) |
Service personnel | 79 (11.7) | 19 (8.6) | 7 (3.3) | 53 (21.1) |
Professional skilled worker | 132 (19.5) | 45 (20.4) | 52 (25.2) | 35 (13.9) |
Educational level, n (%) | ||||
Primary school | 14 (2.1) | 0 | 2 (1.0) | 12 (4.8) |
Junior high school | 54 (8.0) | 8 (3.6) | 11 (5.3) | 35 (14.0) |
High school or secondary school | 153 (22.6) | 29 (13.1) | 21 (10.2) | 103 (41.0) |
College and above | 457 (67.4) | 184 (83.3) | 172 (83.5) | 101 (40.2) |
Marital status, n (%) | ||||
Unmarried | 196 (28.9) | 88 (40.0) | 51 (24.8) | 57 (22.7) |
Married | 442 (65.2) | 124 (56.1) | 141 (68.4) | 177 (70.5) |
Divorced or widowed | 40 (5.9) | 9 (4.1) | 14 (6.8) | 17 (6.8) |
Menstruation, n (%) | ||||
Yes | 82 (12.1) | 18 (8.1) | 26 (12.6) | 38 (15.1) |
No | 596 (87.9) | 203 (91.9) | 180 (87.4) | 213 (84.9) |
Reproductive history, n (%) | ||||
Not pregnancies or births | 267 (39.3) | 76 (28.5) | 71 (34.1) | 100 (37.5) |
1 birth | 278 (41.0) | 79 (28.4) | 69 (35.6) | 68 (24.5) |
2 births | 106 (15.6) | 61 (57.5) | 45 (42.5) | 52 (49.1) |
3 births and above | 27 (4.0) | 5 (18.5) | 21 (77.8) | 31 (87.1) |
Mode of delivery, n (%) | ||||
No births | 237 (35.0) | 71 (32.1) | 86 (41.7) | 80 (31.9) |
Vaginal delivery | 340 (50.1) | 113 (51.1) | 72 (35.0) | 155 (61.8) |
Cesarean section | 101 (14.9) | 37 (16.7) | 48 (23.3) | 16 (6.4) |
