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Table 4 Sex-specific and Delivery models relative risk (RR) and 95 % confidence intervals (CI) for total PTBs for temperature (1, 5, 95 and 99 % percentiles) at different lag days with reference at 24.5 °C

From: The association between ambient temperature and preterm birth in Shenzhen, China: a distributed lag non-linear time series analysis

 

RR(95 % CI)

 

9 °C

12.5 °C

29.9 °C

30.7 °C

Male PTBs

 Lag0

1.58(1.35–1.84)*

1.49(1.33–1.67)*

0.96(0.88–1.06)

0.98(0.88–1.09)

 Lag5

1.05(1.01–1.09)*

1.06(1.03–1.08)*

1.00(0.98–1.02)

1.00(0.97–1.02)

 Lag10

0.99(0.97–1.02)

1.01(0.99–1.02)

0.99(0.97–1.00)*

0.98(0.96–1.00)*

 Lag15

0.99(0.96–1.01)

1.00(0.99–1.02)

0.99(0.98–1.00)*

0.98(0.97–1.00)*

 Lag20

1.00(0.98–1.02)

1.00(0.99–1.02)

0.99(0.98–1.00)*

0.98(0.97–1.00)*

 Lag25

1.02(1.00–1.04)*

1.01(1.00–1.02)*

0.99(0.98–1.00)*

0.98(0.97–0.99)*

 Lag30

1.06(1.01–1.10)*

1.02(0.99–1.04)

0.99(0.97–1.02)

0.98(0.96–1.01)

 Cumul

1.97(1.37–2.83)*

1.96(1.54–2.49)*

0.74(0.62–0.88)*

0.64(0.52–0.80)*

Female PTBs

 Lag0

1.49(1.25–1.77)*

1.48(1.30–1.68)*

0.93(0.84–1.03)

0.95(0.84–1.08)

 Lag5

1.01(0.97–1.06)

1.04(1.01–1.06)*

0.99(0.97–1.01)

0.99(0.96–1.02)

 Lag10

1.00(0.97–1.04)

1.01(0.99–1.03)

0.98(0.97–1.00)*

0.98(0.96–1.00)*

 Lag15

0.99(0.96–1.02)

1.01(1.00–1.03)*

0.99(0.98–1.00)*

0.98(0.97–1.00)*

 Lag20

0.99(0.96–1.02)

1.01(1.00–1.03)*

0.99(0.97–1.00)*

0.98(0.97–1.00)*

 Lag25

1.00(0.98–1.02)

1.00(0.99–1.02)

0.98(0.97–0.99)*

0.98(0.97–0.99)*

 Lag30

1.01(0.97–1.06)

0.99(0.96–1.02)

0.97(0.95–1.00)*

0.97(0.95–1.00)*

 Cumul

1.40(0.92–2.12)

1.94(1.48–2.55)*

0.64(0.52–0.78)*

0.60(0.47–0.76)*

Vaginal delivery PTBs

 Lag0

1.36(1.18–1.57)*

1.29(1.16–1.44)*

0.93(0.85–1.01)

0.92(0.84–1.02)

 Lag5

1.02(0.98–1.06)

1.03(1.01–1.05)*

0.99(0.98–1.01)

1.00(0.98–1.02)

 Lag10

1.01(0.98–1.04)

1.02(1.00–1.03)*

0.98(0.97–1.00)*

0.98(0.96–0.99)*

 Lag15

0.99(0.97–1.01)

1.01(1.00–1.02)*

0.99(0.98–1.00)*

0.98(0.97–1.00)*

 Lag20

0.99(0.97–1.01)

1.00(0.99–1.02)

0.99(0.98–1.00)*

0.98(0.97–0.99)*

 Lag25

1.00(0.98–1.02)

1.00(0.99–1.01)

0.99(0.98–1.00)*

0.98(0.96–0.99)*

 Lag30

1.02(0.98–1.06)

0.99(0.97–1.02)

0.98(0.96–1.00)*

0.97(0.94–0.99)*

 Cumul

1.58(1.12–2.22)*

1.67(1.33–2.10)*

0.69(0.58–0.81)*

0.58(0.48–0.71)*

Cesarean section PTBs

 Lag0

1.78(1.46–2.17)*

1.76(1.52–2.04)*

0.97(0.86–1.09)

1.02(0.89–1.18)

 Lag5

1.06(1.00–1.11)*

1.07(1.04–1.10)*

0.99(0.97–1.02)

0.99(0.96–1.02)

 Lag10

0.98(0.95–1.02)

1.00(0.98–1.02)

0.99(0.97–1.01)

0.99(0.97–1.01)

 Lag15

0.98(0.96–1.01)

1.01(0.99–1.02)

0.98(0.97–1.00)*

0.98(0.96–1.00)*

 Lag20

1.00(0.97–1.03)

1.01(1.00–1.03)*

0.98(0.97–1.00)*

0.98(0.96–1.00)*

 Lag25

1.03(1.00–1.05)*

1.02(1.00–1.03)*

0.99(0.97–1.00)*

0.99(0.97–1.00)*

 Lag30

1.06(1.00–1.12)*

1.02(0.99–1.05)

0.99(0.97–1.02)

1.00(0.96–1.03)

 Cumul

1.93(1.21–3.08)*

2.33(1.71–3.16)*

0.70(0.56–0.88)*

0.68(0.51–0.90)*

  1. *P < 0.05
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Environmental Health

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