Table 3.
Comparison of characteristics of patients divided according to preterm birth
| Variable | Preterm birth < 34 weeks of gestation | Preterm birth < 37 weeks of gestation | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Yes n (%) |
No n (%) |
OR | 95%CI | p-value | Yes n (%) |
No n (%) |
OR | 95%CI | p-value | |
| Maternal age, years old | 0.98 | (0.86–1.12) | 0.748 | 0.97 | (0.91–1.02) | 0.210 | ||||
| Nullipara | ||||||||||
| Yes | 3 (0.5) | 634 (99.5) | 0.34 | (0.09–1.38) | 0.133 | 25 (3.9) | 612 (96.1) | 0.68 | (0.39–1.20) | 0.186 |
| No | 6 (1.4) | 336 (98.6) | Ref | Ref | 25 (5.7) | 417 (94.3) | Ref | Ref | ||
| Overweight (BMI ≥ 25) | ||||||||||
| Yes | 0 (0.0) | 105 (100) | – | – | – | 2 (1.9) | 103 (98.1) | 0.375 | (0.09–1.56) | 0.178 |
| No | 9 (0.9) | 965 (90.1) | 48 (4.9) | 926 (95.1) | Ref | Ref | ||||
| Diabetes mellitus | ||||||||||
| Yes | 2 (6.7) | 28 (93.3) | 10.63 | (2.11–53.50) | 0.004* | 3 (10.0) | 27 (90.0) | 2.37 | (0.69–8.09) | 0.169 |
| No | 7 (0.7) | 1042 (99.3) | Ref | Ref | 47 (4.5) | 1002 (95.5) | Ref | Ref | ||
| Thyroid disease | ||||||||||
| Yes | 0 (0.0) | 73 (100) | – | – | – | 3 (4.1) | 70 (95.9) | 0.87 | (0.27–2.88) | 0.825 |
| No | 9 (0.9) | 997 (90.1) | 47 (4.7) | 959 (95.3) | Ref | Ref | ||||
| GDM | ||||||||||
| Yes | 0 (0.0) | 128 (100) | – | – | – | 2 (1.6) | 126 (98.4) | 0.30 | (0.07–1.26) | 0.099 |
| No | 9 (0.9) | 942 (90.1) | 48 (5.0) | 903 (95.0) | Ref | Ref | ||||
| BV in the early stage of pregnancy | ||||||||||
| Yes | 0 (0.0) | 74 (100) | – | – | – | 3 (4.1) | 71 (95.9) | 0.86 | (0.26–2.84) | 0.806 |
| No | 9 (0.9) | 996 (90.1) | 47 (4.7) | 958 (95.3) | Ref | Ref | ||||
| GBS-positive in the early stage of pregnancy | ||||||||||
| Yes | 4 (6.6) | 57 (93.4) | 14.22 | (3.72–54.38) | < 0.001* | 6 (9.8) | 55 (90.2) | 2.42 | (1.01–5.91) | 0.045* |
| No | 5 (0.5) | 1013 (99.5) | Ref | Ref | 44 (4.3) | 974 (95.7) | Ref | Ref | ||
| BV during the 3rd trimester | ||||||||||
| Yes | – | – | – | 2 (3.6) | 53 (96.4) | 1.24 | (0.29–5.31) | 0.777 | ||
| No | – | – | 29 (3.0) | 949 (97.0) | Ref | Ref | ||||
| GBS-positive during the 3rd trimester | ||||||||||
| Yes | – | – | – | – | – | 5 (5.1) | 93 (94.9) | 1.88 | (0.71–5.01) | 0.207 |
| No | 26 (2.8) | 909 (97.2) | Ref | Ref | ||||||
P-value for bivariable regression analysis
OR Odds ratio, CI Confidence interval, BMI Body mass index, GDM Gestational diabetes mellitus, BV Bacterial vaginosis, GBS Group B Streptococcus
*Statistically significant