Table 3 Comparison of disc-fovea distance (DF) among three groups.

	Group 1			Group 2			Group 3			p-value	Post-Hoc (Bonferroni)
	n	Mean	SD	n	Mean	SD	n	Mean	SD	p-value	Group 1 vs. 2	Group 1 vs. 3	Group 2 vs. 3
Disc-fovea distance, mm
PMA 34 weeks	28	4.52	0.43	30	4.64	0.28	32	4.62	0.22	0.319	0.450	0.757	> .999
PMA 35 weeks	26	4.41	0.48	28	4.60	0.21	34	4.56	0.15	0.056	0.072	0.166	> .999
PMA 36 weeks	27	4.49	0.36	29	4.56	0.21	26	4.46	0.24	0.419	> .999	> .999	0.609
PMA 37 weeks	27	4.53	0.31	28	4.53	0.22	34	4.47	0.17	0.526	> .999	> .999	0.955
PMA 38 weeks	25	4.53	0.24	30	4.48	0.22	27	4.41	0.19	0.106	> .999	0.109	0.569
PMA 39 weeks	27	4.43	0.26	25	4.42	0.34	25	4.38	0.15	0.762	> .999	> .999	> .999
PMA 40 weeks	27	4.46	0.19	27	4.35	0.19	36	4.29	0.18	0.002*	0.112	0.002*	0.553

*A p-value < 0.05 was considered statistically significant. The DF of PMA 40 weeks showed a significant difference between Group 1 and 3 (p = 0.002).

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