Table 3 Perinatal outcome among singletons by socioeconomic position and by time, Finland, 1991–2006 (N = 931 285)
1991–31994­–61997–92000–22003–6
N192 333183 248168 258163 092224 354
Prematurity (%)*
Upper white-collar workersI4.14.14.44.54.1
Lower white-collar workersII4.44.54.64.64.6
Blue-collar workersIII5.05.04.85.04.6
OthersO4.74.84.95.04.8
Total4.54.64.74.84.6
Low birth weight (%)†
Upper white-collar workersI2.72.62.92.82.8
Lower white-collar workersII2.93.03.03.13.2
Blue-collar workersIII3.63.73.53.83.4
OthersO3.33.33.33.53.5
Total3.13.13.23.33.2
SGA (%)†
Upper white-collar workersI1.71.61.81.71.8
Lower white-collar workersII1.91.82.01.92.0
Blue-collar workersIII2.42.42.52.52.4
OthersO2.02.02.12.12.2
Total2.02.02.12.02.1
LGA (%)‡
Upper white-collar workersI3.33.22.92.92.6
Lower white-collar workersII3.63.43.33.33.2
Blue-collar workersIII3.43.53.13.23.1
OthersO3.73.73.23.03.2
Total3.53.53.23.12.9
Perinatal mortality (1/1000)†
Upper white-collar workersI4.74.85.03.43.0
Lower white-collar workersII5.85.05.14.14.1
Blue-collar workersIII7.26.66.25.64.1
OthersO8.67.86.07.06.1
Total6.55.95.55.14.5
Birth weight (g) mean (SD)
I3585 (545)3588 (541)3565 (546)3563 (543)3555 (532)
II3580 (557)3574 (555)3559 (558)3555 (556)3551 (554)
III3546 (579)3543 (579)3527 (569)3529 (577)3528 (556)
O3575 (583)3558 (576)3536 (567)3531 (573)3521 (562)
Total3573 (565)3567 (562)3549 (561)3545 (562)3539 (553)
Adjusted OR (95% CI)§
Prematurity
Upper white-collar workersI1.001.001.001.001.00
Lower white-collar workersII1.13 (1.06 to 1.21)1.16 (1.09 to 1.23)1.10 (1.03 to 1.17)1.05 (0.99 to 1.12)1.14 (1.08 to 1.20)
Blue collar workersIII1.32 (1.24 to 1.43)1.32 (1.24 to 1.43)1.16 (1.08 to 1.25)1.17 (1.09 to 1.26)1.14 (1.07 to 1.22)
OthersO1.27 (1.17 to 1.38)1.33 (1.24 to 1.43)1.25 (1.17 to 1.34)1.23 (1.16 to 1.31)1.24 (1.18 to 1.31)
Low birth weight
Upper white-collar workersI1.001.001.001.001.00
Lower white-collar workersII1.14 (1.05 to 1.24)1.21 (1.12 to 1.30)1.16 (1.08 to 1.24)1.11 (1.03 to 1.19)1.18 (1.10 to 1.25)
Blue collar workersIII1.49 (1.36 to 1.63)1.52 (1.40 to 1.66)1.25 (1.17 to 1.40)1.35 (1.24 to 1.46)1.25 (1.16 to 1.34)
OthersO1.36 (1.23 to 1.50)1.49 (1.37 to 1.62)1.37 (1.26 to 1.49)1.31 (1.22 to 1.41)1.34 (1.26 to 1.43)
SGA
Upper white-collar workersI1.001.001.001.001.00
Lower white-collar workersII1.14 (1.03 to 1.26)1.24 (1.13 to 1.37)1.19 (1.09 to 1.31)1.14 (1.04 to 1.26)1.19 (1.10 to 1.29)
Blue collar workersIII1.44 (1.30 to 1.63)1.69 (1.51 to 1.89)1.45 (1.34 to 1.66)1.54 (1.38 to 1.72)1.44 (1.31 to 1.58)
OthersO1.20 (1.07 to 1.36)1.59 (1.42 to 1.78)1.39 (1.25 to 1.55)1.39 (1.26 to 1.55)1.39 (1.28 to 1.51)
LGA
Upper white-collar workersI1.001.001.001.001.00
Lower white-collar workersII1.12 (1.04 to 1.21)1.10 (1.02 to 1.19)1.17 (1.08 to 1.28)1.15 (1.06 to 1.26)1.23 (1.15 to 1.33)
Blue collar workersIII1.11 (1.01 to 1.21)1.15 (1.05 to 1.26)1.14 (1.03 to 1.26)1.18 (1.07 to 1.31)1.24 (1.14 to 1.36)
OthersO1.06 (0.97 to 1.16)1.09 (1.00 to 1.20)1.11 (1.01 to 1.22)1.08 (0.99 to 1.18)1.10 (1.01 to 1.18)
Perinatal mortality
Upper white-collar workersI1.001.001.001.001.00
Lower white-collar workersII1.38 (1.14 to 1.68)1.14 (0.95 to 1.37)1.08 (0.89 to 1.30)1.16 (0.93 to 1.43)1.46 (1.20 to 1.77)
Blue collar workersIII1.79 (1.44 to 2.21)1.50 (1.22 to 1.85)1.33 (1.07 to 1.66)1.63 (1.28 to 2.08)1.44 (1.13 to 1.83)
OthersO1.81 (1.46 to 2.26)1.57 (1.27 to 1.93)1.33 (1.08 to 1.64)1.85 (1.49 to 2.30)2.28 (1.88 to 2.76)
  • *All differences between the socioeconomic groups are statistically significant (p<0.001) excluding for years 1997–9 (p = 0.022).

  • †All differences between the socioeconomic groups are statistically significant (p<0.001).

  • ‡All differences between the socioeconomic groups are statistically significant (p = 0.027, 0.014, 0.006, 0.010 and <0.001, respectively).

  • §Adjusted by maternal age, parity and county of residence. Statistically significant differences are shown in bold.