Table 1.

Over all occurrence of E. coli isolates with different factors in diarrheic calves.

Variables	Category	Number examined	Number positive	Category proportion (%)	Samples proportion (%)	χ2	P value
Age(week)	1–2	44	33	75.0	29.5	16.31	0.001
	3–8	39	16	41.0	14.3
	9–16	29	9	31.1	8.0
Sex	Female	89	49	55.0	43.8	1.86	0.177
	Male	23	9	39.1	8.0
Breed	Cross	94	48	51.1	42.9	0.398	0.390
	Local	18	10	55.6	8.9
FCFT	> 6 h	20	16	80.0	14.3	5.26	0.027
	< 6 h	92	42	45.7	37.5
CF	Same barn	66	37	56.1	33.0	1.18	0.279
	Separated	46	21	45.7	18.8
AMGPT	1–1.5 L	49	37	75.5	33.1	20.66	0.001
	1.5–2.5 L	33	9	27.3	8.0
	Unknown	30	12	40.0	10.7
Navel treatment	No	54	35	64.8	31.3	7.09	0.008
	Yes	58	23	39.7	20.5
Each total		112			51.8

FCFT first colostrum feeding time, AMGPT amount of milk given per time, CF calving facility; χ² Chi square, P probability.