Table 3.
Association of maternal CRP, C3, C4 and ferritin levels and the risk of PTB in the first trimester
| PTB | Term | Unadjusted | Adjusted | ||||
|---|---|---|---|---|---|---|---|
| (n) | (n) | Pa | OR (95%CI) | Pb | OR (95%CI) | Pc | |
| CRP | 0.043 | ||||||
| P50 < 11.40 | 24 | 68 | 1 | – | 1 | – | |
| P50 - P75 (11.40–16.60) | 20 | 34 | 1.67 (0.80–3.51) | 0.175 | 1.73 (0.81–3.67) | 0.154 | |
| P75 > 16.60 | 24 | 34 | 2.13 (1.01–4.50) | 0.048 | 2.16 (1.02–4.56) | 0.044 | |
| C3 | 0.045 | ||||||
| P50 < 1222.00 | 26 | 68 | 1 | – | |||
| P50 - P75 (1222.00–1369.00) | 16 | 34 | 1.32 (0.60–2.90) | 0.493 | 1.45 (0.64–3.30) | 0.370 | |
| P75 > 1369.00 | 26 | 33 | 2.28 (1.06–4.91) | 0.034 | 2.53 (1.14–5.64) | 0.023 | |
| C4 | 0.178 | ||||||
| P50 < 258.50 | 30 | 68 | 1 | – | 1 | – | |
| P50 - P75 (258.50–309.00) | 13 | 35 | 0.85 (0.38–1.87) | 0.679 | 0.85 (0.38–1.88) | 0.689 | |
| P75 > 309.00 | 25 | 33 | 1.77 (0.88–3.57) | 0.111 | 1.89 (0.93–3.85) | 0.079 | |
| ferritin | 0.107 | ||||||
| P50 < 84.07 | 27 | 68 | 1.00 | – | 1 | – | |
| P50 - P75 (84.07–138.85) | 17 | 34 | 1.27 (0.62–2.63) | 0.512 | 1.29 (0.62–2.67) | 0.492 | |
| P75 > 138.85 | 24 | 34 | 1.92 (0.92–4.04) | 0.084 | 2.03 (0.95–4.34) | 0.067 | |
Pa Kruskal Wallis test
Pb unadjusted conditional logistic regression analysis
Pc adjusted age conditional logistic regression analysis