Long-Term Clinical Course of Normal-Tension Glaucoma: 20 Years of Experience

Table 3

Comparisons among 3 groups (nondippers, dippers, and overdippers).

	Nondippers	Dippers	Overdippers	value
MD slope (dB/y)	−0.20 ± 0.21	−0.24 ± 0.20^§	−0.28 ± 0.30^†‡	0.000
MAP (mmHg)	95.1 ± 4.4	94.6 ± 3.3	90.7 ± 5.9^†‡	0.000
OPP (mmHg)	52.3 ± 6.1	51.7 ± 4.7	46.2 ± 5.4^†‡	0.000
wSD	14.0 ± 2.0	13.9 ± 2.1	15.3 ± 1.3^†‡	0.014

Expressed as the mean ± SD; comparison among 3 groups by one-way analysis of variance; statistical significance: ; ^†significantly different compared with nondippers by post hoc multiple comparison (Bonferroni’s test); ^‡significantly different compared with dippers by post hoc multiple comparison (Bonferroni’s test); ^§significantly different compared with nondippers by post hoc multiple comparison (Bonferroni’s test); MD: mean deviation; MAP: mean arterial pressure; OPP: ocular perfusion pressure; wSD: weighted standard deviation.