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. 2019 Jun 7;19:711. doi: 10.1186/s12889-019-7022-8

Table 3.

Coefficient estimates of OLS and quantile regression at different quantiles

	OLS	Quantile
	OLS	0.25	0.5	0.75	0.9
Age	−2.65^a	−1.70^a	− 4.59^a	−4.70^a	−9.35^a
Education	−1.72^a	0.85^a	1.19^a	−0.43	−6.90^a
Income	−0.32	−0.53	0	−1.03^a	−5.25^a
Commute time	4.54^a	0.05	−0.91^a	−1.78^a	2.03
Vehicle	−15.99^a	−6.51^a	−15.79^a	− 14.55^a	−48.54^a
Smoking	7.93^a	1.70^a	2.22^a	5.70^a	17.56^a
Ventilation	0.87	−0.30^a	2.13^a	1.04^a	−4.52^a
BMI	8.36^a	4.15^a	12.75^a	8.83^a	36.17^a
Respiratory	5.35^a	1.33^a	4.06^a	4.20^a	27.87^a

Note: ^adenotes significantly different coefficient from zero at the 5% significance level