Table 1.

Spontaneous frequency of DNA damage in the individual datasets contributed by participating laboratories. 1a) tail length; 1b) % tail DNA; 1c) tail moment, and 1d) arbitrary units.

1a) Tail Length (μm)
Laboratory	N	Mean (SD)	Median	25°−75° Percentile
AS4	77	49.91 (11.7)	48.9	41.1‒59.9
CSA5	138	39.9 (22.7)	42.5	17.6‒54.1
CSA6	129	27.3 (6.6)	26.6	22.9‒30.1
EU12	42	10.1 (3.3)	9.6	7.9‒13.2
EU15	101	28.3 (18.1)	21.3	15.0‒37.3
EU17	18	48.2 (4.2)	47.5	45.9‒51.5
EU25	76	3.1 (1.1)	3.1	2.4‒3.6
EU26	973	36.2 (19.0)	28.2	21.7‒47.1
EU30	92	1.5 (1.0)	1.5	0.7‒2.0
EU32	562	41.8 (14.0)	46.7	41.4‒50.6
EU33	97	30.2 (14.7)	32.5	16.5‒41.9
EU36	302	45.1 (20.2)	38.9	29.5‒54.1
EU4	171	13.9 (1.2)	13.9	13.1‒14.6
EU41	187	6.2 (3.7)	5.40	3.5‒8.5
EU50	37	21.8 (5.9)	21.4	18.1‒23.7
TOTAL	3,002	32.3 (20.4)	28.6	16.6‒47.1
Controls only	1,228	28.6 (17.5)	26.6	14.2‒43.6
1b) Tail Intensity (%)
Laboratory	N	Mean (SD)	Median	25°−75° Percentile
AS4	77	4.5 (1.4)	4.2	3.6‒5.0
EU12	42	0.01 (0.01)	0.02	0.01‒0.02
EU15	101	24.0 (9.1)	23.6	18.8‒31.1
EU17	115	7.4 (4.6)	5.4	4.6‒9.1
EU18	57	6.7 (2.1)	6.0	5.5‒7.0
EU22	752	8.1 (7.3)	7.2	1.1‒14.6
EU23	86	1.2 (1.2)	0.8	0.4‒1.7
EU24	92	13.8 (9.0)	13.3	5.2‒21.1
EU25	76	3.1 (1.0)	3.0	2.4‒3.3
EU26	1,076	9.5 (7.3)	7.2	4.3‒12.2
EU27	17	2.9 (0.7)	3.2	2.5‒3.4
EU28	32	6.5 (2.8)	6.5	4.0‒8.7
EU3	1,637	2.7 (2.3)	2.0	1.1‒3.6
EU30	92	0.9 (0.9)	0.6	0.3‒1.2
EU31	142	30.0 (16.0)	29.0	15.5‒39.0
EU32	494	0.7 (1.0)	0.2	0.1‒0.8
EU33	1,061	16.5 (12.2)	12.9	7.0‒21.3
EU34	170	6.4 (3.1)	6.4	3.8‒8.2
EU36	441	6.7 (2.5)	6.6	5.0‒8.3
EU37	287	10.7 (2.4)	10.4	9.2‒12.6
EU4	111	1.1 (0.6)	1.1	0.7‒1.6
EU41	187	7.0 (3.6)	6.4	4.3‒9.2
EU43	162	2.7 (2.1)	2.1	1.2‒3.6
EU45	93	1.4 (4.3)	0.4	0.1‒1.0
EU46	329	3.2 (1.9)	2.8	1.8‒4.0
EU50	37	6.4 (1.5)	6.2	5.8‒7.1
EU6	325	1.1 (1.0)	.9	0.3‒1.6
OCNA1	202	9.5 (5.6)	7.7	6.2‒11.0
TOTAL	8,293	7.4 (8.8)	4.5	1.6‒9.9
Controls only	4,625	4.8 (5.5)	2.9	1.1‒6.7
1c) Tail Moment (arbitrary units)
Laboratory	N	Mean (SD)	Median	25°−75° Percentile
AS4	77	1.6 (0.4)	1.5	1.3‒1.8
CSA5	35	2.0 (1.3)	1.4	1.2‒2.4
CSA6	129	1.3 (1.0)	1.1	0.5‒1.7
EU12	221	0.4 (0.4)	0.4	0.1‒0.7
EU15	173	27.3 (15.7)	25.2	16.0‒34.8
EU21	151	1.8 (1.7)	1.4	0.7‒2.4
EU23	86	0.6 (0.9)	0.3	0.1‒0.9
EU25	76	0.3 (0.2)	0.2	0.1‒0.3
EU26	824	2.1 (2.7)	1.2	0.6‒2.6
EU30	92	0.5 (1.3)	0.01	0.01‒0.2
EU33	273	10.2 (13.5)	3.0	1.3‒18.4
EU36	302	1.4 (0.7)	1.4	0.9‒1.8
EU4	111	0.1 (0.1)	0.1	0.1‒0.2
EU8	41	0.3 (0.2)	0.3	0.2‒0.4
OCNA1	202	1.5 (1.9)	0.9	0.6‒1.6
TOTAL	2,793	3.96 (8.9)	1.1	0.5‒2.4
Controls only	1,181	2.8 (6.9)	0.9	0.4‒1.8
1d) Visual scoring (arbitrary units)
Laboratory	N	Mean (SD)	Median	25°−75° Percentile
CSA2	71	114.2 (31.0)	118.0	89.0‒138.0
CSA3	56	8.8 (5.3)	7.8	5.1‒10.5
CSA5	55	204.8 (53.6)	217.0	159.0‒254.0
CSA6	76	74.1 (7.9)	73.5	70.0‒78.5
CSA7	1,206	21.6 (21.7)	15.0	6.0‒30.0
EU14	103	198.1 (29.3)	202.5	190.0‒207
EU19	89	288.7 (36.2)	284.0	264.5‒315.8
EU30	41	28.5 (20.5)	24.0	12.5‒42.5
EU31	1,468	78.9 (59.0)	59.1	41.0‒95.3
EU36	55	116.5 (7.6)	118.0	110.0‒122.0
EU37	238	17.9 (16.1)	13.0	7.0‒24.0
EU42	49	23.5 (14.0)	21.8	12.4‒32.3
EU7	1,006	26.0 (16.0)	23.0	18.0‒31.0
TOTAL	4,513	–	–	–