TABLE 2.

Comparison of Maternal Characteristics Between Mothers of Infants Who Died and Mothers of Infants Who Survived

Mothers of Infants Who Died (n = 352)Mothers of Infants Who Survived (n = 371)P Value*
Mother's age at delivery, y; mean (SD)28.1 (6.2)28.2 (6.5).76
    Not known12
Mother's ethnic group
    White251 (82.0)256 (78.5).32
    Other55 (18.0)70 (21.5)
    Not known4645
Mother's civil status.08
    Single68 (20.5)92 (25.7)
    Married183 (55.3)183 (51.1)
    Cohabiting74 (22.4)74 (20.7)
    Separated/divorced6 (1.8)9 (2.5)
    Not known2113
Relevant medical history before this pregnancy195 (56.2)198 (54.2).59
    Not known56
Smoking (per day)
    None203 (63.0)221 (62.6).97
    Not known3018
Mother kept antenatal appointments313 (94.6)328 (94.8)>.99§
    Not known2125
Multiparous225 (63.9)237 (64.1)>.99
    Not known01
Obstetric history
    Previous preterm deliveries (<37 wk)72/225 (32.0)69/237 (30.3).60
    Previous stillbirths (>24 wk)19/217 (8.8)16/233 (7.0).55
    Previous spontaneous miscarriage (<13 wk)67/217 (30.9)84/233 (36.7).23
    Previous spontaneous miscarriage (13–23 + 6 wk)17/217 (7.8)25/233 (11.0).38
    Previous neonatal death (<28 d)12/217 (5.5)10/233 (4.4).71
    Previous postneonatal death (28–364 d)6/217 (2.8)3/233 (1.3).43
    Termination of pregnancy on >2 occasions9/217 (4.1)7/233 (3.1).68
Complications during pregnancy
    PROM111 (31.6)120 (32.4).88
        Gestation at PROM, median (IQR)26.4 (22.0–27.4)27.1 (26.0–27.8)<.001
        PROM–delivery interval; d; median (IQR)5.2 (1.4–40.0)4.0 (1.6–12.5).07
        Not known11
    Pregnancy-induced hypertension80 (22.9)72 (19.5).30
        Not known21
    Bacteriuria19 (5.4)38 (10.4).02
        Not known134
    Major placental bleeding64 (18.2)69 (18.8).93
        Not known13
    Chorioamnionitis36 (10.3)49 (13.2).26
        Not known21
    Preterm labor179 (51.0)225 (60.8).01
        Not known11
Antenatal steroids, complete course (>24 h and <7 d)157 (48.5)200 (55.9).05
    Not known2813
Characteristics of hospital of delivery
    NICU, routine referrals232 (67.4)236 (64.0).16
    NICU, in-house78 (22.7)107 (29.0)
    No NICU, transfers some19 (5.5)13 (3.5)
    No NICU, transfers all14 (4.1)11 (3.0)
    Not applicable82
    Not known12
No. of deliveries Jan 1, 1998–Dec 31, 1998; mean (SD)3701.0 (1180.9)3563.2 (1067.7).11
    Not known146
No. of level 1 intensive care days Jan 1, 1998–Dec 31, 19981100.01027.0.96
    Median (IQR)(447.7–1623.5)(468.0–1672.5)
    No. not known2219
  • Data are n (%) unless otherwise stated. IQR indicates interquartile range.

  • * χ2 test unless stated otherwise.

  • t test.

  • χ2 test compares single/separated/divorced with married/cohabiting.

  • § Unbooked/never/sometimes combined for χ2 test.

  • Mann-Whitney test. Distribution of number of level 1 intensive care days was skewed; hence, medians and IQR are shown, and the Mann-Whitney test used.