. 2019 Sep 28;16(19):3652. doi: 10.3390/ijerph16193652

Table 3.

Meta-regression analysis of study level predictors on the association between air pollution and risk of conjunctivitis.

Air pollutants	Covariant	IQR	Estimate	p-Value	τ²	I²	R ²
NO₂	GDP	343.07	0.24 (−2.69, 3.26)	0.873	0.000385	78.586981	0.00
	Latitude	19.21	0.57 (−2.25, 3.47)	0.695	0.000350	72.085796	0.00
	Longitude	119.96	0.44 (−2.19, 3.14)	0.745	0.000383	75.242153	0.00
	Temperature	4.28	−0.43 (−2.25, 1.42)	0.644	0.000497	85.336819	0.00
	Humidity Duration of sunshine	3.26 0.82	−2.02 (−4.35, 0.37) −2.77 (−5.60, 0.16)	0.097 0.063	0.000194 0.000188	75.394247 63.712071	44.37 33.48
O₃	GDP	246.99	−0.65 (−1.46, 0.17)	0.120	0.000054	92.101803	0.00
	Latitude	18.61	0.70 (−0.51, 1.91)	0.259	0.000068	93.591351	0.00
	Longitude	122.10	−0.55 (−1.37, 0.28)	0.193	0.000056	93.062946	0.00
	Temperature	11.19	−0.70 (−1.83, 0.44)	0.227	0.000056	84.472565	0.00
	Humidity Duration of sunshine	4.98 0.76	−0.76 (−1.42, −0.10) 0.42 (−0.67, 1.52)	0.023 0.455	0.000009	45.134099 90.739265	0.00
	Humidity Duration of sunshine	4.98 0.76	−0.76 (−1.42, −0.10) 0.42 (−0.67, 1.52)	0.023 0.455	0.000073	45.134099 90.739265	0.00
PM_2.5	GDP	238.83	−0.40 (−1.06, 0.27)	0.238	0.000018	66.205320	0.00
	Latitude	7.01	−0.07 (−0.58, 0.44)	0.786	0.000047	63.714683	0.00
	Longitude	52.65	0.11 (−0.29, 0.51)	0.600	0.000042	65.152911	0.00
	Temperature	4.28	0.00 (−0.55, 0.55)	0.995	0.000049	62.464757	0.00
	Humidity Duration of sunshine	3.26 0.53	−0.17 (−1.32, 0.99) −0.52 (−1.25, 0.21)	0.771 0.163	0.000030 0.000013	63.120757 69.255955	0.00 0.00
PM₁₀	GDP	266.31	−0.71 (−2.00, 0.60)	0.284	0.000033	69.797637	0.00
	Latitude	12.71	0.51 (−0.21, 1.22)	0.165	0.000021	59.017623	8.35
	Longitude	60.26	-0.38 (−1.05, 0.30)	0.278	0.000027	67.965036	0.00
	Temperature	6.13	−0.73 (−1.77, 0.32)	0.171	0.000020	67.213050	23.38
	Humidity Duration of sunshine	2.44 0.63	−0.32 (−0.85, 0.21) 0.04 (−1.34, 1.44)	0.240 0.951	0.000020 0.000039	76.922096 64.984042	20.53 0.00
SO₂	GDP	230.65	0.20 (−2.13, 2.59)	0.865	0.000314	89.692112	0.00
	Latitude	15.03	0.99 (−1.43, 3.47)	0.425	0.000319	89.037967	0.00
	Longitude	68.46	0.01 (−1.43, 1.47)	0.994	0.000358	90.307176	0.00
	Temperature	6.58	−0.47 (−2.26, 1.35)	0.608	0.000268	91.617762	0.00
	Humidity	3.04	−0.52 (−2.10, 1.08)	0.523	0.000221	90.558627	0.00
	Duration of sunshine	0.66	−0.71 (−4.23, 2.93)	0.698	0.000380	89.840483	0.00

Note: CO—carbon monoxide; NO₂—nitrogen dioxide; SO₂—sulfur dioxide; O₃—ozone; PM_2.5—particles smaller than 2.5μm; PM₁₀—particles smaller than 10μm; GDP—gross domestic product; IQR—interquartile range. The descriptive information of city-level predictors is provided in Table A2.