Table 4.
Association of maternal CRP, C3, C4 and ferritin levels and the risk of PTB in the second trimester
| PTB | Term | Unadjusted | Adjusted | ||||
|---|---|---|---|---|---|---|---|
| (n) | (n) | Pa | OR (95%CI) | Pb | OR (95%CI) | Pc | |
| CRP | 0.211 | ||||||
| P50 < 14.9700 | 48 | 115 | 1.00 | – | 1.00 | – | |
| P50 - P75 (14.9700–20.8375) | 35 | 59 | 1.48 (0.83–2.64) | 0.179 | 1.50 (0.84–2.66) | 0.173 | |
| P75 > 20.8375 | 32 | 57 | 1.39 (0.77–2.50) | 0.275 | 1.35 (0.75–2.44) | 0.321 | |
| C3 | 0.259 | ||||||
| P50 < 1313.00 | 51 | 115 | 1.00 | – | 1.00 | ||
| P50 - P75 (1313.00–1457.00) | 30 | 59 | 1.18 (0.65–2.12) | 0.592 | 1.15 (0.63–2.08) | 0.650 | |
| P75 > 1457.00 | 34 | 56 | 1.37 (0.76–2.46) | 0.296 | 1.33 (0.74–2.41) | 0.342 | |
| C4 | 0.336 | ||||||
| P50 < 252.50 | 51 | 115 | 1.00 | – | 1.00 | – | |
| P50 - P75 (252.50–305.25) | 31 | 58 | 1.20 (0.69–2.08) | 0.514 | 1.18 (0.68–2.05) | 0.558 | |
| P75 > 305.25 | 33 | 58 | 1.33 (0.74–2.39) | 0.349 | 1.25 (0.69–2.29) | 0.463 | |
| ferritin | 0.943 | ||||||
| P50 < 39.3550 | 59 | 115 | 1.00 | – | 1.00 | – | |
| P50 - P75 (39.3550–82.7550) | 26 | 59 | 0.83 (0.45–1.54) | 0.558 | 0.81 (0.44–1.53) | 0.522 | |
| P75 > 82.7550 | 30 | 57 | 1.02 (0.56–1.86) | 0.949 | 1.03 (0.56–1.88) | 0.922 | |
Pa Kruskal Wallis test
Pb unadjusted conditional logistic regression analysis
Pc adjusted age conditional logistic regression analysis