Table 1 Association between demographic data and the course of pregnancy
Variable | n | Threatened premature birth, n = 28 (%) | Non-threatened premature birth, n = 44 (%) | p value* |
|---|---|---|---|---|
Age (years) | ||||
 ≤24 | 9 | 5 (55.6) | 4 (44.4) | 0.531 |
 ≥25, ≤34 | 51 | 19 (37.3) | 32 (62.7) | |
 ≥35 | 12 | 4 (33.7) | 8 (66.7) | |
Birth history | ||||
 Primipara | 36 | 14 (38.9) | 22 (61.1) | 0.595 |
 Multipara | 36 | 14 (38.9) | 22 (61.1) | |
Smoking habits | ||||
 Current smokers | 8 | 3 (37.5) | 5 (62.5) | 0.374 |
 Has a history of smoking but quit smoking | 22 | 6 (27.2) | 16 (72.7) | |
 Never smoked | 42 | 19 (45.2) | 23 (54.8) | |
A history of miscarriage, premature birth, or threatened premature birth in the past | ||||
 No | 59 | 24 (40.7) | 35 (59.3) | 0.369 |
 Yes | 13 | 4 (30.8) | 9 (69.2) | |