Table 4.

Daily frequency of activities associated with manipulation of chemicals (in % of respondents).

		First year	Second year	Third year	Volunteers
		(n = 73)a	(n = 141)a	(n = 86)a	(n = 28)a
		(max = 68)b	(max = 137)b	(max = 86)b	(max = 26)b
		(min = 59)c	(min = 131)c	(min = 82)c	(min = 24)c
Application of permanent waving	0 per day	27.9	18.2	14.5	23.1
	[1 – 2]	45.9	38.6	49.4	46.2
	[3 – 5]	24.6	34.9	32.5	26.9
	[6 – 15]	1.6	8.3	3.6	3.8
Rinsing permanent waving	0 per day	3.2	6.7	10.6	4.0
	[1 – 2]	62.9	38.5	47.1	52.0
	[3 – 5]	30.7	45.9	37.6	40.0
	[6 – 15]	3.2	8.9	4.7	4.0
Applying neutralizing agent	0 per day	9.8	8.3	10.5	4.2
	[1 – 2]	63.9	39.8	46.5	54.1
	[3 – 5]	24.6	42.9	34.9	37.5
	[6 – 15]	1.7	9.0	8.1	4.2
Preparing hair colour	0 per day	17.2	9.8	1.2	4.0
	[1 – 4]	32.8	22.5	25.9	4.0
	[5 – 9]	35.9	37.6	40.0	64.0
	[10 – 25]	14.1	30.1	32.9	28.0
Applying hair colour	0 per day	10.3	3.6	0	3.8
	[1 – 4]	48.5	33.6	26.5	30.8
	[5 – 9]	32.4	36.5	47.0	38.5
	[10 – 22]	8.8	26.3	26.5	26.9
Rinsing hair colour	0 per day	0	1.5	1.2	0
	[1 – 4]	32.8	18.7	20.2	15.4
	[5 – 9]	47.8	34.3	53.6	50.0
	[10 – 25]	19.4	45.5	25.0	34.6
Preparing hair bleaches	0 per day	45.9	23.9	16.9	12.0
	[1 – 2]	22.9	34.6	40.9	44.0
	[3 – 6]	14.8	24.6	24.1	28.0
	[7 – 20]	16.4	16.9	18.1	16.0
Applying hair bleaches	0 per day	64.4	34.4	23.2	32.0
	[1 – 2]	22.0	40.5	39.0	44.0
	[3 – 6]	6.8	19.8	25.6	20.0
	[7 – 20]	6.8	5.3	12.2	4.0
Rinsing hair bleaches	0 per day	31.7	15.3	14.3	24.0
	[1 – 2]	30.2	43.5	42.9	48.0
	[3 – 6]	22.2	30.5	28.6	24.0
	[7 – 20]	15.9	10.7	14.3	4.0

a: numbers apprentices by level; b: maximum number of respondents for the set of questions; c: minimum number of respondents for the set of questions.