Table 4

The average urinary NMF concentrations (mg/l) collected at pre-shift on five consecutive days for the workers in a synthetic leather (SL) factory and from a copper laminate circuit board (CLCB) factory*

	Weekday	W1	W2	W3	W4	W5	W1–W5	F test
*The NMF concentrations collected at the first voided urine from the reference groups on W1 and W5 were under the detection limit.
***p<0.001 by one way ANOVA test.
ND, under the limit of detection (LOD = 0.02 mg/l).
SL	n	22	22	23	25	25	117
	GM (GSD)	0.25 (5.88)	0.47 (6.14)	1.58 (4.94)	1.29 (2.40)	2.82 (2.09)	0.98 (4.13)
	Range	0.04–4.82	0.04–11.92	0.04–14.67	0.26–9.90	0.27–14.57	0.04–14.67	5.86***

CLCB	Weekday	W1	W2	W3	W4	W5	W1-W5
	n	19	18	17	18	18	90
	GM (GSD)	0.23 (3.85)	0.35 (3.12)	0.33 (2.14)	0.37 (1.17)	0.27 (1.62)	0.32 (3.32)
	Range	ND*–3.33	ND–5.69	ND–2.08	0.12–3.30	ND–3.12	ND–5.69	2.31