Table 2.

Rates of correct answers in the intervention group (n = 94 answers) compared with the control group (n = 124 answers) stratified by question difficulty, question topic, question structure, and background characteristics

		Intervention group (online network ArboAntwoord)		Control group (common information sources)			Intervention vs control group
		n/N	%	n/N	%		RD%a	95% CIb
Total (all questions)		58/94	62	24/124	19		43	30–54
Question difficulty
	Simple	25/47	53	12/63	19		34	16–50
	Complex	33/47	70	12/61	20		50	33–65
Question topic
	OSHc law and regulations	24/29	83	11/38	29		54	31–71
	OSH content	34/65	52	13/86	15		37	22–51
Question structure
	Single	18/31	58	10/50	20		38	17–57
	Double	40/63	63	14/74	19		44	29–58
Gender
	Female	39/56	70	18/66	27		43	25–57
	Male	19/38	50	6/58	10		40	22–56
Age group (years)
	15–24	NAd		NA			NA
	25–34	22/34	65	6/28	21		44	19–63
	35–44	15/24	63	10/44	23		40	15–60
	45–54	16/26	62	6/40	15		47	23–66
	≥55	5/10	50	2/12	17		33	–7 to 66
Educational level
	Low	14/22	64	4/26	15		49	21–69
	Intermediate	22/34	65	9/42	21		44	21–61
	High	22/38	58	11/56	20		38	19–56
Role
	Worker	40/64	63	20/84	24		39	23–53
	Employer/manager	7/16	44	1/26	4		40	16–64
	OSH (semi)professional	11/14	79	3/14	21		58	20–80
Company size
	Small	22/38	58	9/54	17		41	22–58
	Medium	16/32	50	5/36	14		36	14–55
	Large	20/24	83	10/34	29		54	29–72
Self-rated Internet and computer experience
	Inexperienced	12/16	75	3/32		9	66	38–8
	Experienced	46/78	59	21/92		23	36	22–49

^a Rate difference.

^b Confidence interval.

^c Occupational safety and health.

^d Not applicable.