From: The association between PM2.5 exposure and suicidal ideation: a prefectural panel study
Variable | Description | Mean | S.D. | Min | Max |
---|---|---|---|---|---|
ISI-1 | Index of the suicide ideation measured by search volumes of indirect signals of suicidal thoughts from Baidu using PCA method (16 items) | 0.016 | 0.967 | −0.640 | 7.224 |
ISI-2 | Index of the suicidal ideation measured by search volumes of five short sentences in Chinese from Baidu using PCA method (5 items) | 0.014 | 0.891 | −0.517 | 5.736 |
PM2.5 | Prefecture’s weekly average PM2.5 100 μg·m− 3 in 2017 | 0.862 | 0.499 | 0.189 | 8.670 |
PM10 | Prefecture’s weekly average PM10 100 μg·m−3 in 2017 | 5.416 | 3.120 | 0.330 | 44.460 |
SO2 | Prefecture’s weekly average SO2100 μg·m−3 in 2017 | 1.224 | 1.159 | 0.020 | 19.480 |
NO2 | Prefecture’s weekly average NO2100 μg·m−3 in 2017 | 2.092 | 1.018 | 0.120 | 6.860 |
WebPortal | Frequency of surfing Chinese major web portal | 0.019 | 1.010 | −0.933 | 11.408 |
PoSearch | Frequency of searching air pollution related items | 0.019 | 0.889 | −0.840 | 32.592 |
Temp | Weekly averaged day mean temperature | 15.897 | 10.582 | −23.900 | 34.786 |
Rain | Weekly ratio of rainy days (Rain) | 0.265 | 0.243 | 0.000 | 1.000 |
Sunlight | Weekly sunlight | 23.067 | 21.164 | 0.000 | 105.441 |