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Table 3 Maternal age categories 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

All PTBs

 Lag0

1.54(1.36–1.75)*

1.49(1.35–1.63)*

0.95(0.87–1.02)

0.96(0.88–1.05)

 Lag5

1.03(1.00–1.07)*

1.05(1.03–1.07)*

0.99(0.98–1.01)

1.00(0.98–1.02)

 Lag10

1.00(0.97–1.02)

1.01(0.99–1.02)

0.99(0.97–1.00)*

0.98(0.97–1.00)*

 Lag15

0.99(0.97–1.01)

1.01(1.00–1.02)*

0.99(0.98–1.00)*

0.98(0.97–0.99)*

 Lag20

1.00(0.98–1.01)

1.01(1.00–1.02)*

0.99(0.98–1.00)*

0.98(0.97–0.99)*

 Lag25

1.01(1.00–1.03)*

1.01(1.00–1.02)*

0.99(0.98–1.00)*

0.98(0.97–0.99)*

 Lag30

1.04(1.00–1.07)*

1.01(0.99–1.03)

0.99(0.97–1.00)*

0.98(0.96–1.00)*

 Cumul

1.72(1.28–2.33)*

1.96(1.60–2.39)*

0.69(0.60–0.80)*

0.62(0.52–0.74)*

Maternal age 15 ~ 19 group PTBs

 Lag0

1.50(0.85–2.67)

1.62(1.06–2.49)*

1.03(0.74–1.42)

0.96(0.66–1.40)

 Lag5

1.12(0.97–1.29)

1.07(0.98–1.17)

1.00(0.93–1.07)

1.01(0.93–1.10)

 Lag10

1.00(0.90–1.12)

1.01(0.95–1.07)

0.97(0.93–1.02)

0.98(0.92–1.04)

 Lag15

0.97(0.89–1.06)

1.00(0.96–1.05)

1.00(0.97–1.04)

1.01(0.96–1.05)

 Lag20

0.98(0.90–1.07)

1.00(0.96–1.05)

1.02(0.98–1.05)

1.01(0.97–1.06)

 Lag25

1.02(0.95–1.10)

1.01(0.97–1.06)

1.01(0.98–1.05)

1.00(0.96–1.04)

 Lag30

1.07(0.92–1.25)

1.02(0.93–1.12)

1.01(0.94–1.08)

0.98(0.90–1.07)

 Cumul

3.72(0.95–14.60)

2.74(1.15–6.52)*

1.04(0.56–1.94)

0.93(0.43–2.00)

Maternal age 20 ~ 34 group PTBs

 Lag0

1.61(1.40–1.85)*

1.54(1.39–1.71)*

0.95(0.87–1.03)

0.98(0.89–1.08)

 Lag5

1.03(1.00–1.07)*

1.05(1.02–1.07)*

0.99(0.97–1.01)

0.99(0.97–1.01)

 Lag10

1.00(0.98–1.03)

1.01(1.00–1.03)*

0.98(0.97–1.00)*

0.98(0.97–1.00)*

 Lag15

0.99(0.97–1.01)

1.01(1.00–1.02)*

0.99(0.98–1.00)*

0.98(0.97–0.99)*

 Lag20

0.99(0.97–1.01)

1.01(1.00–1.02)*

0.99(0.98–1.00)*

0.98(0.97–0.99)*

 Lag25

1.01(0.99–1.03)

1.01(1.00–1.02)*

0.99(0.98–1.00)*

0.98(0.97–0.99)*

 Lag30

1.03(1.00–1.07)*

1.01(0.98–1.03)

0.98(0.97–1.00)*

0.98(0.96–1.00)*

 Cumul

1.74(1.25–2.42)*

2.02(1.63–2.51)*

0.70(0.60–0.82)*

0.64(0.53–0.78)*

Maternal age 35 ~ 49 group PTBs

 Lag0

1.53(1.10–2.13)*

1.49(1.16–1.91)*

0.92(0.75–1.13)

0.94(0.75–1.20)

 Lag5

1.05(0.97–1.14)

1.09(1.04–1.15)*

1.02(0.98–1.07)

1.01(0.96–1.06)

 Lag10

0.94(0.88–1.00)*

1.00(0.96–1.03)

1.00(0.96–1.03)

0.99(0.95–1.03)

 Lag15

0.99(0.94–1.04)

1.01(0.98–1.04)

0.98(0.96–1.01)

0.98(0.95–1.01)

 Lag20

1.02(0.97–1.07)

1.02(0.99–1.05)

0.98(0.96–1.00)*

0.98(0.95–1.01)

 Lag25

1.03(0.99–1.08)

1.01(0.98–1.04)

0.99(0.97–1.01)

0.99(0.96–1.01)

 Lag30

1.04(0.95–1.14)

1.00(0.95–1.05)

1.00(0.95–1.04)

1.00(0.95–1.05)

 Cumul

1.86(0.86–4.04)

2.27(1.36–3.79)*

0.66(0.45–0.98)*

0.57(0.36–0.92)*

  1. *P < 0.05