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Table 2 Descriptive Statistics of Major Variables

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