Table 2.

Factors associated with L. sabrazesi infection of chickens in Chiang Rai, Kanchanaburi and Phatthalung provinces.

Parameters	Number of examined samples	Number of positive samples	Total (%)	χ2 (df)	p-value
Breed				2.7132 (1)	0 .099518
Native	150	115	76.67
Layer	163	137	84.05
Total	313	252	80.51
Age				53.9465 (1)	< 0.00001
0–4 months	40	38	95.00
4–12 months	182	164	90.11
> 12 months	91	50	54.95
Total	313	252	80.51
Gender				0.0383 (1)	0.844754
Male	78	61	78.21
Female	235	191	81.28
Total	313	252	80.51
Management system				31.0085 (2)	< 0.00001
Backyard in households	186	138	74.19
Free-range farms	91	86	94.51
Non-evaporative cooling houses	36	28	77.78
Total	313	252	80.51
Type of feeds				0.6267 (2)	0.731003
Commercial	36	28	77.78
Natural	156	124	79.49
Mixed	121	100	82.64
Total	313	252	80.51
Water source				18.4521 (1)	0.000017
Yes	255	217	85.10
No	58	35	60.34
Total	313	252	80.51
Insect control system				1.2544 (1)	0.262717
Yes	25	18	72.00
No	288	234	81.25
Total	313	252	80.51

χ² = Chi-square; df = degree of freedom.