Time series study on the effect of air pollutants on hospitalization risk of arrhythmia patients in Hefei
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摘要:
目的 探讨合肥市空气污染物暴露对心律失常每日住院人数的影响,为制定适当的干预措施提供科学依据。 方法 收集2015—2020年期间合肥市每日日平均温度、日平均湿度等气象数据,空气污染物数据和心律失常患者住院人数数据。采用时间序列的分布滞后非线性模型分析2015—2020年合肥市空气污染物对人群发病住院人数的累积效应和滞后效应,并进行亚组分析。 结果 在控制长期趋势和混杂因素后,本研究显示,PM2.5、PM10、NO2和CO对心律失常发病住院人数均有影响;在分组中,PM2.5、PM10和CO对女性患者、年龄<65岁患者住院人数有影响,且均存在滞后效应,NO2对男性患者住院人数有影响且存在滞后性。PM10浓度每升高10 μg/m3,对心律失常住院人数的影响在当天差异有统计学意义,且效应值最大(RR=1.021,95% CI:1.004~1.038);PM2.5浓度每升高10 μg/m3, 对心律失常住院人数的影响累积至第1天差异有统计学意义,且累积效应值达最大(RR=1.025,95% CI:1.011~1.041);NO2和CO浓度每升高10 μg/m3,对心律失常住院人数的影响均累积至第2天差异有统计学意义,且累积效应值达最大(RR=1.111,95% CI: 1.010~1.223;RR=1.248,95% CI: 1.065~1.462);SO2和O3对心律失常住院人数的影响差异均无统计学意义(均P>0.05)。 结论 合肥市空气污染物(PM2.5、PM10、NO2、CO)浓度升高可导致居民心律失常发病住院风险增加。 Abstract:Objective To investigate the effect of air pollutant exposure on the daily hospitalization number of cardiac arrhythmias in Hefei, and to provide a scientific basis for the development of appropriate intervention measures. Methods Meteorological data such as daily average temperature, daily average humidity, air pollutants (PM2.5, PM10, NO2, SO2, CO, O3) and the number of hospitalizations of patients with cardiac arrhythmias were collected in Hefei city from 2015 to 2020. A time-series distributed lag nonlinear model was used to analyze the cumulative and lag effects of air pollutants on the number of hospital cases and hospitalizations in Hefei from 2015 to 2020, and subgroup analysis was performed. Results After controlling for long-term trends and confounding factors, this study showed that PM2.5, PM10, NO2 and CO had a significant effect on the number of hospitalizations for arrhythmia onset. In the subgroup, PM2.5, PM10 and CO had an effect on the number of female patients and patients aged <65 years, and all had a lag effects. NO2 had an effect on the number of male inpatients with a lag effect. Every increase of PM10 concentration by 10 μg/m3 had a statistically significant difference in the number of hospitalized patients with arrhythmia on the same day, and the effect value was the largest(RR=1.021, 95% CI: 1.004-1.038). When PM2.5 concentration increased by 10 μg/m3, there was a statistically significant difference in the number of hospitalized patients with arrhythmia on the first day, and the cumulative effect value reached the largest(RR=1.025, 95% CI: 1.011-1.041). When NO2 and CO concentrations increased by 10 μg/m3, the effects on the number of hospitalized patients with arrhythmia accumulated to the second day, and the cumulative effect value reached the largest(RR=1.111, 95% CI: 1.010-1.223; RR=1.248, 95% CI: 1.065-1.462). The effects of SO2 and O3 on the number of hospitalized patients with arrhythmia were not statistically significant (all P>0.05). Conclusion The increased concentrations of air pollutants (PM2.5, PM10, NO2, CO) in Hefei can lead to an increased risk of hospitalization for the development of cardiac arrhythmias in the population. -
表 1 2015—2020年合肥市空气污染物浓度、气象因素、住院人数情况
Table 1. Air pollutant concentration, meteorological factors and number of inpatients in Hefei from 2015 to 2020
项目 最小值 P25 P50 P75 最大值 空气污染物 PM10(μg/m3) 8.00 48.00 71.00 99.00 361.00 SO2(μg/m3) 2.00 6.00 9.00 13.00 58.00 NO2(μg/m3) 9.00 28.00 37.00 52.00 137.00 PM2.5(μg/m3) 5.00 28.00 42.00 64.00 243.00 CO(mg/m3) 0.30 0.60 0.80 1.00 2.80 O3(μg/m3) 4.00 57.00 86.00 120.00 269.00 气象因素 日平均气温(℃) -6.67 8.72 17.56 24.50 34.61 日相对湿度(%) 33.00 69.00 78.00 86.00 100.00 心律失常住院人数 每日人数(人) 0 2 4 5 13 表 2 2015—2020年合肥市空气污染物浓度与气象因素Spearman相关分析结果(r值)
Table 2. Spearman correlation analysis of air pollutant concentration and meteorological factors in Hefei from 2015 to 2020 (r value)
项目 日平均温度
(℃)日相对湿度
(%)PM10
(μg/m3)SO2
(μg/m3)NO2
(μg/m3)PM2.5
(μg/m3)CO
(mg/m3)O3
(μg/m3)日平均温度(℃) 1.000 日相对湿度(%) 0.025 1.000 PM10(μg/m3) -0.203a -0.508a 1.000 SO2(μg/m3) -0.260a -0.418a 0.626a 1.000 NO2(μg/m3) -0.306a -0.287a 0.639 0.440a 1.000 PM2.5(μg/m3) -0.452a -0.182a 0.812a 0.565a 0.546a 1.000 CO(mg/m3) -0.300a -0.006 0.658a 0.598a 0.532a 0.815a 1.000 O3(μg/m3) 0.672a -0.363a 0.074a -0.133a -0.013 -0.202a -0.231a 1.000 注:aP<0.05。 表 3 单污染物模型中污染物浓度每增加10 μg/m3对不同人群心律失常住院人数的相对危险度和95%置信区间
Table 3. Relative risk and 95% confidence intervals for hospitalizations for arrhythmias for every 10 μg/m3 increasein contaminant concentration in a single contaminant model
单污染物模型 男性 女性 < 65岁 ≥65岁 当日效应 PM10 1.008(0.984~1.033) 1.037(1.009~1.066)a 1.037(1.010~1.064)a 1.007(0.983~1.032) SO2 1.052(0.952~1.162) 0.982(0.857~1.126) 1.049(0.926~1.188) 1.005(0.906~1.115) NO2 1.105(1.006~1.214)a 1.007(0.882~1.149) 1.114(0.991~1.253) 1.038(0.939~1.148) PM2.5 0.994(0.975~1.012) 1.062(1.037~1.086)a 1.052(1.029~1.075)a 0.996(0.977~1.015) CO 1.076(0.901~1.285) 1.535(1.209~1.950)a 1.522(1.217~1.902)a 1.056(0.880~1.266) O3 0.972(0.926~1.021) 0.981(0.926~1.040) 0.948(0.895~1.004) 1.003(0.956~1.053) 多日累积滞后最大效应 PM10 1.007(0.970~1.046) 1.051(1.014~1.089)a 1.040(1.004~1.077)a 1.004(0.966~1.043) SO2 1.024(0.914~1.148) 1.146(0.937~1.401) 1.075(0.891~1.296) 1.006(0.862~1.175) NO2 1.168(1.026~1.330)a 1.129(0.911~1.398) 1.134(0.967~1.330) 1.099(0.980~1.233) PM2.5 0.995(0.975~1.016) 1.082(1.054~1.111)a 1.066(1.029~1.105)a 1.003(0.983~1.024) CO 1.130(0.912~1.400) 1.781(1.273~2.492)a 1.648(1.202~2.259)a 1.105(0.888~1.376) O3 1.020(0.943~1.103) 1.007(0.942~1.077) 1.003(0.929~1.083) 0.995(0.940~1.054) 注:aP<0.05。 表 4 单污染物模型中不同时间自由度敏感性分析
Table 4. Sensitivity analysis of different time degrees of freedom in a single pollutant model
变量 df=6 df=7 df=8 df=9 PM2.5 1.017(1.004~1.031)a 1.019(1.006~1.032)a 1.019(1.006~1.033)a 1.018(1.003~1.034)a PM10 1.020(1.004~1.037)a 1.021(1.004~1.038)a 1.020(1.003~1.037)a 1.019(1.002~1.036)a SO2 1.037(0.963~1.117) 1.024(0.951~1.102) 1.025(0.952~1.103) 1.015(0.944~1.093) CO 1.230(1.079~1.403)a 1.235(1.084~1.407)a 1.227(1.076~1.398)a 1.217(1.069~1.386)a NO2 1.071(0.998~1.150) 1.070(0.997~1.147) 1.063(0.992~1.141) 1.060(0.989~1.137) O3 0.968(0.935~1.001) 0.976(0.943~1.010 0.975(0.942~1.009) 0.975(0.943~1.009) 注:aP<0.05。 -
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