TABLE II.

Segmented regression models for literature-based analysis

	All Studies		Non-Welder Studies		Welder Studies
	Estimate (CI)	p value	Estimate (CI)	p value	Estimate (CI)	p value
Inflection point*	2.48 (−1.22, 6.19)	--	4.36 (2.05, 6.68)	--	NA	NA
1st segment slope**	−0.003 (−0.051, 0.046)	0.92	0.009 (−0.022, 0.039)	0.57	NA	NA
2nd segment slope**	0.098 (0.043, 0.152)	0.001	0.142 (0.042, 0.239)	0.006	0.291 (0.85, 0.498)	0.014

^*presented in units of ln(μg/m3)

^**presented in units of ln(μg/L)/ln(μg/m3)

p value not presented for inflection point as it is not relevent