■最近的研究表明,炎热的夜晚后死亡风险增加,但是它们对住院的影响,特别是在弱势群体中,仍未得到充分研究。
■每日住院,气象(包括小时),收集了香港2000-19年炎热季节(5月至10月)的空气污染数据。我们得出了三个炎热的夜晚指标:HNday28°C,日最低气温≥28°C,政府对炎热夜晚的定义;HNe,炎热的夜晚过量是通过将夜间超过28°C的每小时温度的热量相加来计算的;和HNday90,使用第90个百分位数HNe(17.7°C·h)作为截止值进行分类的热夜。我们用分布滞后非线性模型拟合了时间序列回归,以检查炎热的夜晚指标与各种住院的关联。
■在3680个研究日期间,5,002,114非癌症非外部(NCNE)住院记录。一半(1874)天经历了夜间热量过多(HNe>0),平均(SD)为8.0(6.8)°C·h;HNday28°C和HNday90确定了499和187个炎热的夜晚,分别。极端HNe(第99百分位数vs0°C·h)与滞后0-4天的NCNE住院率增加3.1%显著相关[95%置信区间:1.5%,总体4.8%],对老年人的影响增强(5.3%[3.2%,7.4%]),低SES个人(5.3%[2.8%,8.0%]),和循环入院(3.4%[0.2%,6.8%])。HNday90,反映了极端的HNe,比官方的HNday28°C更好地识别出危险的炎热夜晚。
■夜间过热与住院率增加显著相关,特别影响老年人和社会经济弱势个人。在定义与公共卫生相关的炎热夜晚时,应结合夜间热强度。
■英国心脏基金会。
UNASSIGNED: Recent studies showed increased mortality risks after hot nights, but their effect on hospitalizations, especially in vulnerable populations, remains under-studied.
UNASSIGNED: Daily hospitalization, meteorological (including hourly), and air pollution data were collected for the hot seasons (May-October) of 2000-19 in Hong Kong. We derived three hot-night metrics: HNday28 °C, daily minimum temperature ≥28 °C, the governmental definition of hot nights; HNe, hot night excess calculated by summing heat excess of hourly temperatures above 28 °C at night; and HNday90th, hot nights classified using the 90th percentile HNe (17.7 °C⋅h) as a cutoff. We fitted time-series regression with distributed lag nonlinear models to examine the associations of hot-night metrics with various hospitalizations.
UNASSIGNED: During the 3680 study days, 5,002,114 non-cancer non-external (NCNE) hospitalizations were recorded. Half (1874) of the days experienced excess nighttime heat (HNe>0) with a mean (SD) of 8.0 (6.8) °C⋅h; 499 and 187 hot nights were identified by HNday28 °C and HNday90th, respectively. Extreme HNe (99th percentile vs 0 °C⋅h) was significantly associated with increased NCNE hospitalizations over lag 0-4 days by 3.1% [95% confidence interval: 1.5%, 4.8%] overall, with enhanced effects in elderly (5.3% [3.2%, 7.4%]), low-SES individuals (5.3% [2.8%, 8.0%]), and circulatory admissions (3.4% [0.2%, 6.8%]). HNday90th, reflecting extreme HNe, better identified hazardous hot nights than the official HNday28 °C.
UNASSIGNED: Excessive nighttime heat is significantly associated with increased hospitalizations, particularly affecting the elderly and socioeconomically disadvantaged individuals. Nighttime heat intensity should be incorporated in defining hot nights with public health relevance.
UNASSIGNED: British Heart Foundation.