Table 5 Characteristics of urine samples from car body repair shop workers per time interval (0 = midnight before working day); fraction of samples above LOD, OR of being above the LOD versus 0–8 am working day (corrected for repeated measurements), and concentration range and median in samples above LOD.

Time interval	Fraction above LOD	OR (95% CI) detectable samples	Median level (range) detects (μg HDA/g C)
0–8 am	6/38	–	13.1 (6.8–50.2)
8–12 am	7/41	1.10 (0.85–1.44)	7.3 (2.3–67.8)
0–3 pm	4/35	1.06 (0.59–1.91)	21.5 (2.7–150.2)
3–6 pm	7/30	2.13 (1.07–4.22)	18.0 (1.9–89.9)
6–12 pm	12/45	2.00 (0.91–4.40)	20.6 (1.9–61.7)
0–8 am next day	12/46	2.04 (0.91–4.59)	8.1 (3.2–65.6)