Table 2

Associations between OHC experience (ages 0–12), school performance (ages 13, 16 and 19) and premature mortality (ages 20–56) (N=14 697)

nDeaths (n)Cox regression analysis
Relative risks (HR) of premature mortality with 95% CI
Laplace regression analysis
Absolute differences (years) in survival time with 95% CI
UnadjustedAdjusted*UnadjustedAdjusted*
OHC
 No OHC (ref)13 6486071100
 OHC1049103 2.28 (1.85 to 2.81) 1.82 (1.43 to 2.32) −10.50 (−13.2 to -7.78) −7.45 (−10.7 to –4.19)
Grade 6 marks (age 13)
 No OHC + marks above average (ref)79462801100
 No OHC + marks at or below average4931277 1.61 (1.37 to 1.90) 1.46 (1.23 to 1.73) −6.19 (−8.33 to -4.05) −4.88 (−7.06 to –2.70)
 No OHC + no marks77150 1.87 (1.38 to 2.52) 1.85 (1.36 to 2.51) −8.10 (−12.0 to -4.19) −7.92 (−11.9 to –3.94)
 OHC + marks above average39029 2.16 (1.47 to 3.17) 1.90 (1.29 to 2.81) −9.92 (−14.6 to -5.26) −8.25 (−13.2 to –3.32)
 OHC + marks at or below average54160 3.29 (2.49 to 4.34) 2.48 (1.80 to 3.40) −15.2 (−19.0 to -11.5) −11.5 (−15.8 to –7.15)
 OHC + no marks11814 3.55 (2.07 to 6.09) 2.81 (1.59 to 4.97) −16.1 (−23.1 to -9.15) −12.9 (−20.1 to –5.70)
Grade 9 marks (age 16)
 No OHC + marks above average (ref)72362361100
 No OHC + marks at or below average5142277 1.67 (1.40 to 1.99) 1.61 (1.35 to 1.93) −6.64 (−8.88 to -4.41) −6.12 (−8.42 to –3.81)
 No OHC + no marks127094 2.31 (1.82 to 2.93) 2.28 (1.79 to 2.90) −10.9 (−14.0 to -7.72) −10.5 (−13.7 to –7.35)
 OHC + marks above average324151.42 (0.85 to 2.39)1.23 (0.72 to 2.10)−4.63 (−11.9 to 2.63)−2.75 (−10.2 to 4.70)
 OHC + marks at or below average47149 3.33 (2.44 to 4.53) 2.76 (1.96 to 3.89) −15.4 (−19.2 to -11.5) −12.8 (−17.2 to –8.39)
 OHC + no marks25439 5.07 (3.60 to 7.12) 4.08 (2.82 to 5.90) −20.5 (−25.1 to -16.0) −17.4 (−22.3 to –12.5)
Grade 12 marks (age 19)
 No OHC + marks above average (ref)43711281100
 No OHC + marks at or below average2267691.04 (0.78 to 1.39)0.94 (0.70 to 1.26)0.43 (−4.21 to 3.35)0.77 (−3.04 to 4.57)
 No OHC + no marks7010410 2.02 (1.66 to 2.47) 2.01 (1.64 to 2.47) −9.00 (−11.6 to -6.42) −9.01 (−11.7 to –6.32)
 OHC + marks above average14361.45 (0.64 to 3.29)1.32 (0.58 to 3.04)−4.63 (−18.2 to 8.98)−3.63 (−17.4 to 10.1)
 OHC + marks at or below average978 2.91 (1.42 to 5.98) 2.46 (1.17 to 5.18) −13.5 (−23.4 to -3.66) −11.4 (−21.5 to –1.22)
 OHC + no marks80989 3.93 (2.99 to 5.15) 3.37 (2.48 to 4.59) −17.3 (−20.8 to -13.8) −15.4 (−19.5 to –11.3)
Total14 697710
  • Statistically significant (p<0.05) estimates are in bold.

  • *Adjusted for sex, household occupational class, household economic poverty, maternal age and maternal marital status.

  • OHC, out of-home care; ref, reference group.