Table 1 Prevalence of stillbirth and characteristics based on groups stratified by placental perfusion
From: Abnormal placental perfusion and the risk of stillbirth: a hospital-based retrospective cohort study
Characteristic | Placental perfusion | P value * | |||
|---|---|---|---|---|---|
Normal (N = 27,720) | Insufficiency (N = 3484) | Not available (N = 10,428) | Across the three groups | Between normal and insufficiency group | |
Stillbirth, no. (‰, 95% confidence interval) | |||||
All a | 25 (0.9, 0.5–1.3) | 15 (4.3, 2.1–6.5) | 16 (1.5, 0.8–2.3) | < 0.001 | < 0.001 |
Unexplainedb | 21 (0.8, 0.4–1.1) | 14 (4.0, 1.9–6.1) | 13 (1.3, 0.6–1.9) | < 0.001 | < 0.001 |
Maternal age at delivery year, no.(%) |  |  |  | < 0.001 | 0.23 |
<  25 | 1250 (5) | 142 (4) | 717 (7) |  |  |
25–34 | 24,012 (87) | 3009 (86) | 8374 (80) |  |  |
> = 35 | 2458 (9) | 333 (10) | 1337 (13) |  |  |
Local residence, no.(%) | 22,006 (79) | 2750 (79) | 7263 (70) | < 0.001 | 0.53 |
Nulliparous, no. (%) | 24,033 (87) | 3010 (86) | 8284 (79) | < 0.001 | 0.62 |
Assisted conception, no. (%) | 452 (2) | 43 (1) | 255 (2) | < 0.001 | 0.078 |
Gestational diabetes mellitus, no. (%) | 2222 (8) | 307 (9) | 972 (9) | < 0.001 | 0.11 |
Preeclampsia, no. (%) | 1370 (8) | 398 (11) | 599 (6) | < 0.001 | 0.003 |
Male sex, no. (%) | 14,188 (51) | 1860 (53) | 5407 (52) | 0.037 | 0.014 |