highly significantp < 0.001
Bartlett’s tests were highly significant in all groups (Lot E: χ 2 = 521.465, df = 66; Lot P: χ 2 = 1723.008, df = 66; Lot M: χ 2 = 21,126.927, df = 55; all p < 0.001), confirming that the correlation matrices departed sufficiently from identity and were therefore appropriate for factor extraction.