Table 3.

Mean baseline (2008) and change (2008–2013) in lung function parameters among current and former hairdressers, and differences between current and former hairdressers in change of lung function parameters, Hebron, Palestine

	Current hairdressers (n=133)				Former hairdressers (n=28)				Difference in change*
	Mean†	Change‡	95% CI		Mean†	Change‡	95% CI		Difference*	95% CI
			Lower	Upper			Lower	Upper		Lower	Upper
FVC (L)	3.29	−35	−44	−26	3.35	−6	−27	+16	+29	+6	+52
FEV1 (L)	2.74	−31	−36	−25	2.75	−11	−26	+3	+19	+4	+35

*Difference in annual decline (mL/year) between former and current hairdressers (former–current), adjusted for age, height and BMI. †Mean value (L) at baseline (2008). ‡Estimated annual decline (mL/year) in lung function, adjusted for age, height and BMI.

BMI, body mass index; FEV₁, forced expiratory volume in 1 s; FVC, forced vital capacity.