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Table 3 Lag-cumulative relative risks of adult asthma hospitalizations associated with extreme cold exposure [2.5th percentile (− 6.5 °C) relative to MAT (22 °C)] and heat exposure [97.5th percentile (29 °C) relative to MAT] stratified by gender and age

From: Associations between ambient temperature and adult asthma hospitalizations in Beijing, China: a time-stratified case-crossover study

Lag days

Cold effects

Heat effects

CRR (95% CI)

CRR (95% CI)

Male

Female

19–64 years old

≥ 65 years old

Male

Female

19–64 years old

≥ 65 years old

Lag 0

1.01 (0.91, 1.12)

1.03 (0.94, 1.12)

0.99 (0.91, 1.08)

1.06 (0.96, 1.17)

1.01 (0.96, 1.07)

1.01 (0.96, 1.06)

1.03 (0.98, 1.08)

0.98 (0.92, 1.04)

Lag 0–3

1.05 (0.77, 1.44)

1.14 (0.88, 1.47)

1.04 (0.80, 1.35)

1.18 (0.87, 1.61)

1.05 (0.87, 1.26)

1.07 (0.91, 1.26)

1.12 (0.96, 1.31)

0.96 (0.79, 1.17)

Lag 0–7

1.12 (0.73, 1.73)

1.34 (0.94, 1.91)

1.26 (0.88, 1.81)

1.22 (0.80, 1.87)

1.09 (0.84, 1.43)

1.21 (0.96, 1.53)

1.26 (1.01, 1.59)*

1.00 (0.75, 1.33)

Lag 0–14

1.29 (0.78, 2.15)

1.85 (1.21, 2.83)*

2.02 (1.32, 3.09)*

1.16 (0.70, 1.93)

1.17 (0.83, 1.65)

1.59 (1.18, 2.15)*

1.55 (1.16, 2.06)*

1.17 (0.81, 1.69)

Lag 0–21

1.47 (0.82, 2.64)

2.43 (1.49, 3.95)*

2.80 (1.72, 4.58)*

1.23 (0.68, 2.22)

1.27 (0.87, 1.86)

2.08 (1.49, 2.91)*

1.88 (1.37, 2.59)*

1.39 (0.92, 2.10)

Lag 0–30

1.64 (0.94, 2.84)

2.90 (1.85, 4.54)*

2.46 (1.56, 3.89)*

2.11 (1.22, 3.64)*

1.47 (0.99, 2.21)

2.60 (1.82, 3.70)*

2.39 (1.71, 3.34)*

1.56 (1.00, 2.43)*

  1. MAT minimum admission temperature, CRR cumulative relative risk, CI confidence interval
  2. *p < 0.05