Table 5.
Association of maternal CRP, C3, C4 and ferritin levels and the risk of PTB in the third trimester
| PTB | Term | Unadjusted | Adjusted | ||||
|---|---|---|---|---|---|---|---|
| (n) | (n) | Pa | OR (95%CI) | Pb | OR (95%CI) | Pc | |
| CRP | 0.964 | ||||||
| P50 < 17.77 | 12 | 22 | 1.00 | – | 1.00 | – | |
| P50 - P75 (17.77–24.08) | 4 | 11 | 0.68 (0.20–2.34) | 0.537 | 0.77 (0.21–2.85) | 0.700 | |
| P75 > 24.08 | 6 | 10 | 1.19 (0.35–4.00) | 0.779 | 1.22 (0.36–4.18) | 0.748 | |
| C3 | 0.228 | ||||||
| P50 < 1443.00 | 14 | 22 | 1.00 | – | 1.00 | ||
| P50 - P75 (1443.00–1640.00) | 6 | 11 | 0.69 (0.19–2.57) | 0.583 | 0.64 (0.17–2.38) | 0.507 | |
| P75 > 1640.00 | 2 | 10 | 0.17 (0.02–1.77) | 0.140 | 0.16 (0.02–1.65) | 0.124 | |
| C4 | 0.433 | ||||||
| P50 < 255.00 | 8 | 22 | 1.00 | – | 1.00 | – | |
| P50 - P75 (255.00–349.00) | 9 | 11 | 3.11 (0.76–12.7) | 0.115 | 2.80 (0.66–11.78) | 0.162 | |
| P75 > 349.00 | 5 | 10 | 1.68 (0.44–6.41) | 0.449 | 1.61 (0.41–6.26) | 0.493 | |
| ferritin | 0.702 | ||||||
| P50 < 10.34 | 9 | 22 | 1.00 | – | 1.00 | – | |
| P50 - P75 (10.34–18.81) | 9 | 11 | 1.91 (0.62–5.86) | 0.258 | 1.66 (0.54–5.15) | 0.378 | |
| P75 > 18.81 | 4 | 10 | 0.94 (0.24–3.78) | 0.935 | 0.58 (0.12–2.82) | 0.500 | |
Pa Kruskal Wallis test
Pb unadjusted conditional logistic regression analysis
Pc adjusted age conditional logistic regression analysis