Table 2.

Dust nicotine loading before and after the cleaning interventions

			Change
	GeoMean µg/m2	95% Confidence Interval	vs. BL1	vs. BL2
Group 1 (N = 10)
Baseline 1	1.23a,b,c	[0.31; 2.82]	Ref
Dry/damp cleaning
Posttest 1	0.82	[0.30; 1.53]	−34%
Baseline 2	0.78a,d	[0.19; 1.64]	−37%	Ref
Wet cleaning
Posttest 2	0.33b,d	[0.07; 0.65]		−58%
Follow-up month 3	0.47c	[0.23; 0.76]		−39%
Group 2 (N = 10)
Baseline 1	1.05	[0.05; 3.00]	Ref
Wet cleaning
Posttest 1	0.58	[0.05; 1.62]	−45%
Baseline 2	0.89	[0.16; 2.06]	−15%	Ref
Dry/damp cleaning
Posttest 2	0.91	[0.23; 1.96]		2%
Follow−up month 3	0.93	[0.34; 1.78]		5%
Group 3 (N = 18)
Baseline 1	1.33a	[0.46; 2.72]	Ref
Combination dry/damp and wet cleaning
Posttest 1	0.42b	[0.04; 0.95]	−68%
Follow-up month 3	1.19a,b	[0.51; 2.17]	−11%

Ref: reference group for the calculation of the percent change in GeoMean.

^a,b,c,d Within each of the cleaning groups, pairs of letters indicate significant differences between GeoMeans (p < .05).