Table 3.

Contingency table for ammonia level^aand urine spot diameter, color,^band edge^ccharacteristics in all cages housing 5 mice

Ammoniaa		Diameter (in.)						Color3			Edge4
		1	2	3	4	5	6	1	2	3	1	2
1	11	8	2	1	0	0	0	11	0	0	11	0
1.5	71	33	35	2	1	0	0	61	10	0	70	1
2	49	2	34	9	3	1	0	24	24	1	39	10
2.5	19	0	13	4	1	1	0	6	12	1	15	4
3	44	0	4	27	12	1	0	4	27	13	16	28
3.5	35	0	0	12	18	4	1	3	23	9	7	28
4	29	0	0	3	11	13	2	0	13	16	2	27
Statistic	γ	0.87						0.82			0.88
	SE	0.02						0.03			0.03
	P	0.0001d						0.0001d			0.0001d

Data are given as the number of cages with the indicated characteristics.

^aAmmonia level codes: 1, less than 1 ppm ammonia (color of indicator disk, yellow); 2, 1–25 ppm (light green); 3, 25–50 ppm (medium green); and 4, more than 50 ppm (dark blue).

^bColor codes: 1, light brown; 2, medium brown; and 3, dark brown.

^cEdge codes: 1, diffuse; and 2, distinct.

^dAmmonia levels significantly (P < 0.0001) correlated with urine spot diameter, color, and edge characteristics.