A prospective cohort study among new Chinese coal miners: the early pattern of lung function change

Table 4

Parameter estimates obtained from mixed effects model analysis of repeated measures of FEV1

Effect	Grouping	Estimate (litres)	Standard error	p Value
Baseline age (year)		0.2560	0.08374	0.0023
Age² (year²)		−0.0058	0.001792	0.0012
Height (cm)		0.0288	0.003188	<0.0001
Pack years		−0.0100	0.01163	0.3904
Mean respirable dust (mg/m³)		−0.0002	0.000210	0.3033
Temperature (°C)		0.0100	0.000276	<0.0001
Group	Referents	−3.4005	1.0868	0.0019
Group	Miners	−3.3475	1.1417	0.0035
Time×group	Referents	0.0084	0.001527	<0.0001
Time×group	Miners	−0.0128	0.000997	<0.0001
Time×time×group	Referents	−0.0001	0.000046	0.0080
Time×time×group	Miners	0.0003	0.000026	<0.0001

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