TABLE 3.

Median and Mean scores on measured factors for the three intervention groups before and after intervention.

Factors		Time intervals
	Group	Before	After	p
Knowledge
Median (quartiles)	0	5.50 (4.50–6.00)	5.50 (5.00–6.25)	0.59
	1	5.00 (4.25–6.00)	6.00 (4.75–6.00)	<0.01
	2	5.50 (5.00–6.00)*	6.25 (5.75–6.75)*	<0.01
Attitudes
Median (quartiles)	0	4.71 (3.43–5.71)	4.57 (3.86–5.71)	0.88
	1	4.29 (2.86–5.14)	4.43 (3.57–5.14)	<0.05
	2	4.43 (3.29–5.86)	5.29 (4.00–5.86)*	0.26
Subjective norms
Median (quartiles)	0	4.33 (2.33–6.00)	4.33 (2.67-6)	0.22
	1	4.00 (2.00–5.33)	4.00 (2.33-5.33)	0.40
	2	3.50 (2.33–5.50)	4.33 (2.67–6.00)	<0.05
Perceived behavioral control
Median (quartiles)	0	6 (2.5–6.5)	5 (1.5–6.5)	0.13
	1	4.5 (2.25–6.25)	5 (3.5–6.5)	0.15
	2	4.5 (3.5–6.5)	5.5 (2.5–6.5)	0.10
Intention
Median (quartiles)	0	5.75 (4.5–7)	5.5 (4.75–6.75)	0.92
	1	5.75 (4.25–6.5)	5.75 (5–6.25)	0.15
	2	5.75 (5-6.75)	6 (5.00–6.75)	0.26
Organization
Median (quartiles)	0	5.33 (4.5–6.33)	5.33 (4.50–6.17)	0.56
	1	5.50 (5–6.17)	5.67 (5.17–6.33)	<0.05
	2	6.00 (4.92–6.5)	5.83 (5.42–6.5)	0.28
Inconveniences
Mean (SD)	0	3.35 (1.08)	3.43 (1.08)	0.85
	1	3.56 (1.10)	3.3 (1.15)	<0.05
	2	3.42 (1.02)	3.10 (1.10)	<0.05
Rate of respirator use
Median (quartiles)	0	5.8 (4.7–6.8)	5.6 (5.2–6.6)	0.73
	1	5.8 (4.9–6.6)	5.8 (4.8–6.4)	0.78
	2	5.6 (4.6–6.4)	5.8 (5.00–6.60)	0.51

Including test statistics. Group 0 = control, Group 1 = Respirator Fit-testing, Group 2 = Respirator Fit-resting + Seminar “Dust and Health” note: Bold, Different from control. Italics, different from before. *, different from other intervention.