Skip to main content

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
  1. * P values were derived from chi-square tests or Fisher’s exact tests if applicable
  2. a The numbers for the placental perfusion normal, insufficiency and unavailable groups were 27,724, 3485, and 10,431, respectively
  3. b Stillbirths from terminations of pregnancy due to congenital anomalies were excluded (8 cases)