Table 1. Characteristics of the study endpoints.
| PID | Total | With | Without | P | |||
|---|---|---|---|---|---|---|---|
| Variables | n | % | n | % | n | % | |
| Total | 121,800 | 30,450 | 25.00 | 91,350 | 75.00 | ||
| Preterm labor | 2,053 | 1.69 | 561 | 1.84 | 1,492 | 1.63 | 0.014 |
| Ectopic pregnancy | 47 | 0.04 | 14 | 0.05 | 33 | 0.04 | 0.050 |
| Age group (years) | <0.001 | ||||||
| 12–19 | 4,280 | 3.51 | 1,347 | 4.42 | 2,933 | 3.21 | |
| 20–29 | 29,497 | 24.22 | 8,194 | 26.91 | 21,303 | 23.32 | |
| 30–39 | 31,841 | 26.14 | 9,091 | 29.86 | 22,750 | 24.90 | |
| 40–49 | 40,502 | 33.25 | 9,287 | 30.50 | 31,215 | 34.17 | |
| 50–55 | 15,680 | 12.87 | 2,531 | 8.31 | 13,149 | 14.39 | |
| Insurance premium (NT$) | <0.001 | ||||||
| <18,000 | 118,694 | 97.45 | 29,759 | 97.73 | 88,935 | 97.36 | |
| 18,000–34,999 | 2,241 | 1.84 | 530 | 1.74 | 1,711 | 1.87 | |
| ≥35,000 | 865 | 0.71 | 161 | 0.53 | 704 | 0.77 | |
| DM | 4,590 | 3.77 | 951 | 3.12 | 3,639 | 3.98 | <0.001 |
| HTN | 5,030 | 4.13 | 920 | 3.02 | 4,110 | 4.50 | <0.001 |
| Hyperlipidemia | 1,183 | 0.97 | 240 | 0.79 | 943 | 1.03 | <0.001 |
| Obesity | 88 | 0.07 | 24 | 0.08 | 64 | 0.07 | 0.629 |
| Heart disease | 4,694 | 3.85 | 1,226 | 4.03 | 3,468 | 3.80 | 0.073 |
| CKD | 1,734 | 1.42 | 271 | 0.89 | 1,463 | 1.60 | <0.001 |
| Season | <0.001 | ||||||
| Spring | 29,400 | 24.14 | 7,218 | 23.70 | 22,182 | 24.28 | |
| Summer | 31,436 | 25.81 | 7,994 | 26.25 | 23,442 | 25.66 | |
| Autumn | 32,529 | 26.71 | 8,427 | 27.67 | 24,102 | 26.38 | |
| Winter | 28,435 | 23.35 | 6,811 | 22.37 | 21,624 | 23.67 | |
| Location | <0.001 | ||||||
| Northern Taiwan | 52,242 | 42.89 | 13,760 | 45.19 | 38,482 | 42.13 | |
| Central Taiwan | 33,199 | 27.26 | 7,632 | 25.06 | 25,567 | 27.99 | |
| Southern Taiwan | 30,132 | 24.74 | 7,345 | 24.12 | 22,787 | 24.94 | |
| Eastern Taiwan | 5,768 | 4.74 | 1,605 | 5.27 | 4,163 | 4.56 | |
| Outlet islands | 459 | 0.38 | 108 | 0.35 | 351 | 0.38 | |
| Urbanization level | <0.001 | ||||||
| 1 (The highest) | 42,479 | 34.88 | 10,287 | 33.78 | 32,192 | 35.24 | |
| 2 | 52,363 | 42.99 | 13,308 | 43.70 | 39,055 | 42.75 | |
| 3 | 10,778 | 8.85 | 2,728 | 8.96 | 8,050 | 8.81 | |
| 4 (The lowest) | 16,180 | 13.28 | 4,127 | 13.55 | 12,053 | 13.19 | |
| Level of care | <0.001 | ||||||
| Hospital center | 38,369 | 31.50 | 10,535 | 34.60 | 27,834 | 30.47 | |
| Regional hospital | 43,302 | 35.55 | 13,473 | 44.25 | 29,829 | 32.65 | |
| Local hospital | 40,129 | 32.95 | 6,442 | 21.16 | 33,687 | 36.88 | |
P-value (category variable: chi-square/Fisher’s exact test; continuous variable: t-test)
* Abbreviations: DM: Diabetes mellitus, HTN: Hypertension, CKD: Chronic kidney disease