Table 2 The cumulative effects (RR and 95% CI) of extreme temperature on children’s outpatient visits for respiratory diseases, with the 1st, 2.5th, 97.5th, and 99th percentiles of the daily mean temperature relative to the reference temperature of 7 °C at different lag days in Harbin

Lag 0–1

0.73 (0.67, 0.79)

0.72 (0.67, 0.78)

1.17 (1.09, 1.26)

1.20 (1.10, 1.29)

Lag 0–2

0.71 (0.64, 0.78)

0.70 (0.64, 0.76)

1.19 (1.10, 1.29)

1.22 (1.12, 1.32)

Lag 0–3

0.68 (0.61, 0.75)

0.67 (0.61, 0.74)

1.23 (1.13, 1.34)

1.26 (1.15, 1.38)

Lag 0–4

0.65 (0.59, 0.73)

0.65 (0.59, 0.72)

1.29 (1.18, 1.41)

1.32 (1.20, 1.46)

Lag 0–5

0.63 (0.56, 0.71)

0.63 (0.57, 0.70)

1.32 (1.20, 1.45)

1.35 (1.22, 1.50)

Lag 0–6

0.61 (0.54, 0.69)

0.61 (0.54, 0.68)

1.34 (1.21, 1.48)

1.38 (1.24, 1.53)

Lag 0–7

0.60 (0.52, 0.68)

0.60 (0.53, 0.67)

1.35 (1.22, 1.50)

1.39 (1.24, 1.55)

Lag 0–8

0.59 (0.52, 0.68)

0.59 (0.52, 0.67)

1.36 (1.22, 1.52)

1.40 (1.25, 1.58)

Lag 0–9

0.59 (0.51, 0.68)

0.59 (0.52, 0.67)

1.38 (1.23, 1.54)

1.42 (1.26, 1.61)

Lag 0–10

0.59 (0.51, 0.69)

0.59 (0.51, 0.68)

1.40 (1.25, 1.58)

1.45 (1.28, 1.65)