Table 2.

Descriptive statistics of the first break up time in the right eye in patients with and without Demodex infestation and results of the t-test with Cochran–Cox correction.

Group	n	NIBUT (seconds) First break up time, right eye					t	df	p
		M ± SD	Variance	Median	Q25–Q75	Min–max
Demodex positive	157	8.00 ± 5.47	29.98	6.37	4.21–10.32	1.91–24.09	-9.65	304.9	< 0.0001
Demodex negative	162	14.73 ± 6.92	47.89	13.87	8.60–22.18	2.29–24.00

Arithmetic mean (M), standard deviation (SD), interquantile range (Q25–Q75), degrees of freedom (df), t-value (t), p-value (p).