tendency towards significanceP = 0.08
A tendency towards significance was found at 28 weeks of age for the number of eggs with hairline cracks between the treatments (χ 2 = 3.01; P = 0.08), with aviary birds producing 0.34% (12 out of 3570) eggs with cracks compared to 0.14% (5 out of 3640) from cage reared birds.