highly significantP < 0.001
Such a difference became highly significant between days 3 and 4 ( χ 2 = 31.11, df = 4, P < 0.001) and between days 4 and 5 ( χ 2 = 20.42, df = 4, P < 0.001). 4.
Such a difference became highly significant between days 3 and 4 ( χ 2 = 31.11, df = 4, P < 0.001) and between days 4 and 5 ( χ 2 = 20.42, df = 4, P < 0.001). 4.