Table 1

Risk of unexplained death in infancy, by ethnic group and other factors. Live singleton births at 22+weeks, England and Wales 2006–2012

FactorBirthsUnexplained infant deathsRate (95% CI)OR (95% CI)
N%n%Crude per 1000Adjusted for birth year
Ethnic group
 White British (ref)3 009 144651129720.38 (0.35 to 0.40)1
 White Non-British340 51576340.19 (0.14 to 0.24)0.50 (0.39 to 0.64)
 Pakistani180 26543320.18 (0.13 to 0.26)0.49 (0.35 to 0.69)
 Indian132 64631910.14 (0.09 to 0.22)0.38 (0.24 to 0.60)
 Bangladeshi62 94411010.16 (0.08 to 0.29)0.42 (0.23 to 0.79)
 Black African154 07133720.24 (0.17 to 0.33)0.64 (0.46 to 0.89)
 Mixed Black-African-White29 31311710.58 (0.34 to 0.93)1.55 (0.96 to 2.50)
 Black Caribbean47 50313120.65 (0.44 to 0.93)1.73 (1.21 to 2.47)
 Mixed Black-Caribbean-White46 44512820.60 (0.40 to 0.87)1.62 (1.11 to 2.36)
 Other/unspecific344 18679260.27 (0.22 to 0.33)0.72 (0.58 to 0.88)
 Unstated287 732610060.35 (0.28 to 0.42)0.89 (0.73 to 1.10)
Parent marital/registration status
 Within marriage (ref)2 499 00654388250.16 (0.14 to 0.17)1
 Joint registration, same address1 398 90530570370.41 (0.37 to 0.44)2.64 (2.32 to 3.01)
 Joint registration, different addresses450 48210309200.69 (0.61 to 0.77)4.46 (3.84 to 5.18)
 Sole registration286 3716292191.02 (0.91 to 1.14)6.55 (5.63 to 7.62)
Mother country of birth
 Non-UK (ref)1 127 46224190120.17 (0.15 to 0.19)1
 UK3 507 302761369880.39 (0.37 to 0.41)2.30 (1.98 to 2.68)
Deprivation, IMD 5ths
 1=Advantaged (ref)708 7381510970.15 (0.13 to 0.19)1
 2771 22717152100.20 (0.17 to 0.23)1.28 (1.00 to 1.64)
 3862 14819231150.27 (0.23 to 0.30)1.75 (1.39 to 2.20)
 41 031 68922399260.39 (0.35 to 0.43)2.53 (2.04 to 3.12)
 5=Disadvantaged1 260 96227668430.53 (0.49 to 0.57)3.46 (2.82 to 4.23)
Gestation, weeks
 37+ (ref)4 376 271941269810.29 (0.27 to 0.31)1
 32–36217 8085224141.03 (0.90 to 1.17)3.54 (3.07 to 4.08)
 22–3140 68516641.62 (1.25 to 2.06)5.57 (4.35 to 7.13)
Mother age, years
 30+ (ref)2 206 39848429280.19 (0.18 to 0.21)1
 25–291 265 68227393250.31 (0.28 to 0.34)1.60 (1.39 to 1.83)
 20–24886 82519465300.52 (0.48 to 0.57)2.69 (2.36 to 3.07)
 <20275 8596272170.99 (0.87 to 1.11)5.03 (4.32 to 5.85)
Sex
 Girl (ref)2 257 08649617400.27 (0.25 to 0.30)1
 Boy2 377 67851942600.40 (0.37 to 0.42)1.45 (1.31 to 1.60)
Total4 634 76410015591000.34 (0.32 to 0.35)
  • Number of live births (N, %); number of unexplained infant deaths (n, %); crude rate per 1000 live singleton births with 95% CI by ethnic group and other factors; OR relative to reference category (adjusted only for birth year). ORs shown in bold have CIs that do not include 1. Likelihood ratio test for ethnic variation (adjusted only for birth year): χ2(10 df)=113.6, p<0.0005.

  • IMD, Index of Multiple Deprivation.