. 2018 Feb 1;13(2):e0191434. doi: 10.1371/journal.pone.0191434

Table 1. Characteristics of participants in obese and non-obese groups.

Variables		Obese (n = 85) Mean ± SD	Non-obese (n = 81) Mean ± SD	t-statistic (df = 164)	p-value
Gender:	Boy	47 (55.3%)^a	33 (40.7%)^a	3.52 (1)^b	0.06^b
	Girl	38 (44.7%)^a	48 (59.3%)^a	3.52 (1)^b	0.06^b
Age, years		9.53 ± 1.62	9.64 ± 1.75	-0.43	0.668
SBP, mm Hg		109.40 ± 11.84	107.53 ± 11.55	1.03	0.304
DBP, mm Hg		69.95 ± 10.24	65.27 ± 8.39	3.21	0.002^*
Axial length, mm		23.22 ± 0.80	23.01 ± 0.75	1.74	0.084
Retinal Vascular Parameters:
Caliber	Arterial	165.84 ± 11.87	172.39 ± 13.25	3.36	0.001^*
	Venular	253.41 ± 18.66	250.35 ± 16.22	-1.13	0.261
Arteriovenous ratio		0.66±0.04	0.69±0.05	-4.83	<0.001^*
Fractal dimension:	Arterial	1.21 ± 0.05	1.22 ± 0.05	-1.44	0.152
	Venular	1.21 ± 0.05	1.19 ± 0.05	2.04	0.043^*
Branching coefficient:	Arterial	1.41 ± 0.41	1.43 ± 0.27	-0.37	0.716
	Venular	1.33 ± 0.32	1.24 ± 0.25	2.05	0.042^*
Simple tortuosity:	Arterial	1.10 ± 0.02	1.09 ± 0.02	1.46	0.146
	Venular	1.10 ± 0.01	1.10 ± 0.02	0.568	0.571
Curvature tortuosity:	Arterial	6.41 ± 1.04	6.24 ± 1.11	1.06	0.292
	Venular	6.73 ± 0.90	6.43 ± 0.71	2.37	0.019^*

SBP, systolic blood pressure; DBP, diastolic blood pressure; SD, standard deviation

^aFrequency (percentage)

^bChi-square test and its p-value.

*Statistical difference (p < 0.05) between the obese and non-obese group