Cumulative RR from DLNM describing associations between asthma hospitalisations and daily mean RH by age group and season, Hong Kong, 2004–2011
| Hot season (n=1232) | Cold season (n=1180) | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Age group | Ref. RH* (%) | High RH† (%) | Lag (day) | Cum. RR | 95% CI | Ref. RH* (%) | Low RH† (%) | Lag (day) | Cum. RR | 95% CI |
| All | 70 | 94 | 0–12 | 1.13 | 0.83 to 1.54 | 83 | 49 | 0–12 | 1.19 | 0.99 to 1.43 |
| Children (<5) | 70 | 94 | 0–3 | 1.46 | 0.93 to 2.28 | 83 | 49 | 0–5 | 0.91 | 0.64 to 1.29 |
| Children (5–14) | 70 | 94 | 0–12 | 4.31 | 1.86 to 9.96 | 83 | 49 | 0–10 | 0.96 | 0.59 to 1.55 |
| Adults (15–59) | 83 | 94 | 0–10 | 1.28 | 0.78 to 2.12 | 83 | 49 | 0–10 | 1.56 | 1.14 to 2.15 |
| Older adults (above 59) | 80 | 94 | 0–10 | 1.08 | 0.71 to 1.66 | 83 | 49 | 0–25 | 1.26 | 0.87 to 1.83 |
*Reference value used for comparison with extreme values was (1) the median of the season for monotonic association or (2) the value associated with the lowest risk of admissions for U-shaped association or (3) the threshold value.
†Extreme values were the 3rd percentile or the 97th percentile during seasons.
DLNM, distributed lag nonlinear model; RH, relative humidity; RR, relative risk.