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Table 3 Abilitya of preterm birthb of the first child to predict preterm birth of the second child for the study population for mothers who gave birth to their first two singleton children between 1994 and 2016 in New South Wales (N = 517,558 mothers)

From: Gestational age as a predictor for subsequent preterm birth in New South Wales, Australia

  

Preterm Birth of Second Child

  

Sensitivity (%, 95 Confidence Interval c)

Positive Predictive Value (%, 95 Confidence Interval c)

  

< 28 weeks

< 32 weeks

< 34 weeks

< 37 weeks

< 28 weeks

< 32 weeks

< 34 weeks

< 37 weeks

Preterm Birth of First Child

< 28 weeks

6.57 (5.46–7.88)

5.64 (4.94–6.43)

4.76 (4.26–5.32)

2.60 (2.40–2.81)

4.35 (3.62–5.24)

8.47 (7.43–9.63)

12.17 (10.94–13.52)

25.32 (23.64–27.07)

< 32 weeks

10.62 (9.22–12.21)

11.31 (10.32–12.37)

10.33 (9.60–11.10)

6.04 (5.75–6.35)

3.26 (2.82–3.78)

7.87 (7.17–8.63)

12.23 (11.37–13.14)

27.29 (26.11–28.50)

< 34 weeks

14.06 (12.45–15.83)

15.75 (14.61–16.97)

15.01 (14.15–15.91)

10.07 (9.70–10.46)

2.61 (2.30–2.97)

6.62 (6.12–7.16)

10.74 (10.11–11.40)

27.49 (26.56–28.43)

< 37 weeks

24.00 (21.99–26.14)

27.17 (25.76–28.63)

28.12 (27.02–29.25)

25.22 (24.67–25.77)

1.28 (1.16–1.41)

3.28 (3.09–3.49)

5.78 (5.53–6.05)

19.78 (19.34–20.23)

 

Specificity (%, 95 Confidence Interval c)

Negative Predictive Value (%, 95 Confidence Interval c)

 

< 28 weeks

< 32 weeks

< 34 weeks

< 37 weeks

< 28 weeks

< 32 weeks

< 34 weeks

< 37 weeks

< 28 weeks

99.54 (99.53–99.56)

99.56 (99.54–99.58)

99.58 (99.56–99.60)

99.63 (99.61–99.64)

99.70 (99.69–99.72)

99.32 (99.30–99.35)

98.84 (98.81–98.87)

95.47 (95.42–95.53)

< 32 weeks

99.01 (98.98–99.03)

99.05 (99.02–99.08)

99.09 (99.06–99.12)

99.22 (99.19–99.24)

99.72 (99.70–99.73)

99.36 (99.34–99.38)

98.90 (98.87–98.93)

95.61 (95.55–95.66)

< 34 weeks

98.34 (98.31–98.38)

98.41 (98.37–98.44)

98.47 (98.43–98.50)

98.71 (98.68–98.74)

99.72 (99.71–99.74)

99.39 (99.37–99.41)

98.95 (98.92–98.98)

95.77 (95.71–95.82)

< 37 weeks

94.16 (94.10–94.22)

94.26 (94.19–94.32)

94.38 (94.31–94.44)

95.04 (94.98–95.10)

99.75 (99.73–99.76)

99.45 (99.43–99.47)

99.07 (99.05–99.10)

96.32 (96.27–96.38)

  1. aSensitivity: Proportion of second preterm births for which the first birth was preterm; Positive Predictive Value: Proportion of first preterm births for which the second birth was preterm; Specificity: Proportion of second births that were not preterm for which the first birth was also not preterm; Negative Predictive Value: The proportion of first births that were not preterm for which the second birth was also not preterm
  2. bPreterm: < 28 weeks, < 32 weeks, < 34 weeks, < 37 weeks
  3. cWilson score confidence interval