Waist-to-height ratio and its associations with body mass index in a sample of Tuscan children in primary school

Table 1 Anthropometric characteristics of the sample of six–11-year-old Tuscan children

	N	Height (m)^b,c	Weight (kg) ^b,c	BMI (kg/m²) ^b,c	Waist circumference (cm) ^b,c	Waist-to-height ratio^c
Boys age (y)
6	124	1.21 ± 0.05	24.13 ± 4.10	16.36 ± 2.04	55.71 ± 4.61	0.46 ± 0.03
7	169	1.28 ± 0.05^a	28.87 ± 5.57^a	17.60 ± 2.60	59.28 ± 5.77^a	0.46 ± 0.04^a
8	170	1.33 ± 0.06	31.60 ± 7.52	17.76 ± 3.12	60.78 ± 7.32^a	0.46 ± 0.05
9	168	1.38 ± 0.06	35.10 ± 7.30	18.33 ± 2.97	62.51 ± 7.11	0.45 ± 0.04
10	148	1.44 ± 0.07	39.90 ± 8.76	19.14 ± 2.95	65.16 ± 7.60^a	0.45 ± 0.04^a
11	42	1.47 ± 0.07	43.54 ± 8.63	20.12 ± 3.29^a	68.14 ± 7.24^a	0.46 ± 0.05^a
All	821	1.34 ± 0.10	32.73 ± 8.93	18.00 ± 2.97	61.23 ± 7.43 ^a	0.46 ± 0.04 ^a
Girls age (y)
6	130	1.20 ± 0.06	24.76 ± 5.58	16.93 ± 2.63	56.03 ± 6.56	0.46 ± 0.05
7	144	1.26 ± 0.06^a	27.49 ± 5.42^a	17.17 ± 2.65	56.98 ± 5.71^a	0.45 ± 0.04^a
8	160	1.31 ± 0.06	31.05 ± 6.65	17.79 ± 2.94	59.08 ± 7.09^a	0.45 ± 0.05
9	135	1.37 ± 0.06	35.01 ± 7.80	18.56 ± 3.20	61.84 ± 7.14	0.45 ± 0.05
10	135	1.43 ± 0.06	38.77 ± 8.19	18.72 ± 3.20	62.82 ± 6.89^a	0.44 ± 0.04^a
11	50	1.48 ± 0.07	41.04 ± 9.18	18.64 ± 3.10^a	62.76 ± 7.51^a	0.42 ± 0.04^a
All	754	1.32 ± 0.10	32.04 ± 8.77	17.88 ± 3.02	59.56 ± 7.24 ^a	0.45 ± 0.05 ^a

^aBoys vs. girls by age group: Student’s t-test for independent data (1574 d.f.) p < 0.05; ^bamong boys by age class: ANOVA (820 d.f.) p < 0.05; ^camong girls by age group: ANOVA (753 d.f.) p < 0.05

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