Table 1.
Maternal characteristics, by hospital grade
| Characteristic | Total n (%) | Tertiary hospitals n (%) | Secondary hospitals n (%) | Statistics | P |
|---|---|---|---|---|---|
| Age (years) | 110,919 (100.00) | 78,885 (100.00) | 32,034 (100.00) | ||
| ≤17 | 194 (0.17) | 96 (0.12) | 98 (0.31) | −69.921 | <0.001 |
| 18–24 | 25,449 (22.94) | 12,803 (16.23) | 12,646 (39.47) | ||
| 25–29 | 46,659 (42.07) | 35,416 (44.90) | 11,243 (35.10) | ||
| 30–34 | 27,466 (24.76) | 22,010 (27.90) | 5456 (17.03) | ||
| 35–39 | 9192 (8.29) | 7071 (8.96) | 2121 (6.62) | ||
| ≥40 | 1959 (1.77) | 1489 (1.89) | 470 (1.47) | ||
| Number of deliveries | 111,767 (100.00) | 79,418 (100.00) | 32,349 (100.00) | ||
| Primiparas | 90,665 (81.12) | 66,643 (83.91) | 24,022 (74.26) | 1399.16 | <0.001 |
| Multiparas | 21,102 (18.88) | 12,775 (16.09) | 8327 (25.74) | ||
| 2 deliveries | 18,975 (16.98) | 11,409 (14.37) | 7566 (23.39) | ||
| ≥3 deliveries | 2127 (1.903) | 1366 (1.72) | 761 (2.35) | ||
| Blood type | 111,072 (100.00) | 78,811 (100.00) | 32,261 (100.00) | ||
| A-B-O blood system | |||||
| Type A | 40,171 (36.17) | 26,410 (33.51) | 13,761 (42.66) | 905.40 | <0.001 |
| Type B | 30,174 (27.18) | 22,218 (28.19) | 7956 (24.66) | ||
| Type 0 | 30,819 (27.75) | 23,179 (29.41) | 7640 (23.68) | ||
| Type AB | 9908 (8.92) | 7004 (8.89) | 2904 (9.00) | ||
| Rh blood system | |||||
| Rh-positive | 109,838 (98.89) | 77,637 (98.51) | 32,201 (99.81) | 119.86 | <0.001 |
| Rh-negative | 1234 (1.11) | 1048 (1.49) | 186 (0.19) | ||
| HBsAg | 111,092 (100.00) | 78,897 (100.00) | 32,195 (100.00) | ||
| Positive | 3717 (3.35) | 2826 (3.58) | 891 (2.77) | 46.89 | <0.001 |
| Negative | 107,375 (96.65) | 76,071 (96.42) | 31,304 (97.23) | ||
| Conception mode | 111,767 (100.00) | 79,418 (100.00) | 32,349 (100.00) | ||
| Natural | 110,640 (98.99) | 78,303 (98.60) | 32,337 (99.96) | 430.24 | <0.001 |
| ART | 1127 (1.01) | 1115 (1.40) | 12 (0.04) |
HBsAg: Hepatitis B surface antigen; ART: Assisted reproductive technology.