Table 4

Age and height adjusted regression coefficients β and standard errors (SE) for the number of TB episodes and the time elapsed from last TB episode to lung function test for 26 311 miners who did not have pneumoconiosis, and loss of lung function after one episode and specific lapsed time

		n		FVC				FEV₁				FEV₁%
		n		β	SE			Loss^4-152	β			SE	Loss^4-152	β	SE	Loss^4-152
1 episode of TB	2137	0.578	0.134^4-165			0.729	0.120^4-165			9.016	1.726^4-165
2 episodes of TB	366	0.388	0.136^4-160			0.556	0.122^4-165			8.307	1.753^4-165
3+ episodes of TB	96	0.329	0.146^4-150			0.472	0.131^4-165			7.211	1.885^4-165
Catogorised time elapsed from last TB episode to lung function test
1–6 months	216	−0.883	0.134^4-165	−0.305		−1.055	0.121^4-165	−0.326		−10.874	1.735^4-165	−1.858
7–12 months	259	−0.791	0.137^4-165	−0.213		−0.975	0.123^4-165	−0.246		−10.963	1.766^4-165	−1.947
13–18 months	198	−0.666	0.138^4-165	−0.088		−0.868	0.124^4-165	−0.139		−10.827	1.778^4-165	−1.811
19–24 months	179	−0.636	0.138^4-165	−0.058		−0.865	0.124^4-165	−0.136		−11.396	1.784^4-165	−2.380
25–36 months	291	−0.653	0.136^4-165	−0.075		−0.882	0.123^4-165	−0.153		−11.405	1.761^4-165	−2.389
37–48 months	268	−0.688	0.137^4-165	−0.110		−0.898	0.123^4-165	−0.169		−11.092	1.765^4-165	−2.076
49–60 months	216	−0.733	0.139^4-165	−0.155		−0.886	0.125^4-165	−0.157		−9.669	1.790^4-165	−0.653
61–375 months	972	−0.665	0.135^4-165	−0.087		−0.895	0.121^4-165	−0.166		−11.597	1.741^4-165	−2.581
Total	df = 26309^4-151	R²= 0.3711			R² = 0.4075			R² = 0.1011

TB = tuberculosis; FEV₁ = forced expiratory volume in one second; FVC = forced vital capacity.
↵4-150 p<0.05;
↵4-160 p<0.01;
↵4-165 p<0.001.
↵4-151 There were 23 710 miners who did not have TB, who were used as a comparison group in the regression model.
↵4-152 Loss of lung function after one episode of TB and specific lapsed time from the last episode of TB.