. 2021 May 27;100(9):101292. doi: 10.1016/j.psj.2021.101292

Table 3.

Hatchability (%), number of unhatched eggs (rate per replication), and number of second grade chicks (rate among hatched eggs per replication) for chickens hatched on-farm (OF) and in a hatchery (HC).

Parameter¹	OF	HC	Ratio	Statistics
Hatchability (%)	95.3 ± 0.44	94.8 ± 0.49	0.90 (0.82–0.97)	$χ_{1}^{2}$ = 6.69, P = 0.0097
Unhatched eggs (‰)	35.7 ± 3.93	36.6 ± 4.03	1.03 (0.93–1.13)	$χ_{1}^{2}$ = 0.30, P = 0.59
Second grade chicks (‰)	11.6 ± 0.93	16.1 ± 1.17	1.38 (1.18–1.63)	$χ_{1}^{2}$ = 15.9, P < 0.0001

Response estimates are back transformed model means, and the effects are shown as odds ratio (OR [95%CI]) for hatchability and rate ratio (RR) for unhatched eggs and second grade chicks,comparing HC with OF.