Profiles of blood pressure among children and adolescents with different body mass index categories in Shandong, China

Figures & data

Figure 1. The proportion of BMI categories in boys and girls (Th1, thinness grade 1. Th2, thinness grade 2. Th3, thinness grade 3. Ob1, obesity grade 1. Ob2, obesity grade 2. Ob3, obesity grade 3. Nor, normal weight. Ov, overweight) *Gender difference p < .01.

Table 1. The proportion of BMI categories in boys and girls aged 7–18 years.

BMI categories	Boys			Girls
	7–12 years	13–18 years	7–18 years	7–12 years	13–18 years	7–18 years
	(n = 11306)	(n = 11098)	(n = 22404)	(n = 11264)	(n = 10962)	(n = 22226)
Thinness grade 3a	0.51	0.38	0.45	0.58	0.47	0.52
Thinness grade 2^b	0.88#	1.32	1.10	1.44*#	2.05*	1.74*
Thinness grade 1^c	5.06#	7.47	6.25	8.02*#	9.82*	8.90*
Normal weight^d	60.72#	69.17	64.90	67.41*#	75.90*	71.60*
Overweight^e	21.39#	16.04	18.74	16.92*#	10.05*	13.53*
Obesity grade 1^f	8.60#	4.71	6.67	4.34*#	1.38*	2.88*
Obesity grade 2^g	2.10#	0.84	1.47	0.96*#	0.31*	0.64*
Obesity grade 3^h	0.74#	0.08	0.42	0.34*#	0.03	0.18*

^aCorresponding to BMI <16 at age 18.

^b Corresponding to BMI 16 to <17 at age 18.

^c Corresponding to BMI 17 to <18.5 at age 18.

^d Corresponding to BMI 18.5 to <25 at age 18.

^e Corresponding to BMI 25 to <30 at age 18.

^f Corresponding to BMI 30 to <35 at age 18.

^g Corresponding to BMI 35 to <40 at age 18.

^h Corresponding to BMI ≥40 at age 18.

* Gender difference p < .01.

# Compared with 13–18 years group p < .01.

Figure 2. Mean values of SBP and DBP for boys and girls with different BMI.

Table 2. Comparisons of Z-score of SBP and DBP and the prevalence of relatively high BP (RHBP) in different groups.

Group	Boys				Girls
	n	ZSBP (+/−SD)	ZDBP (+/−SD)	%RHBP (95%CI)	n	ZSBP (+/−SD)	ZDBP (+/−SD)	%RHBP (95%CI)
Low BMI*	1747	−0.40 ± 1.00	−0.37 ± 0.98	10.76 (9.31–12.21)	2482	−0.30 ± 1.00	−0.19 ± 0.98	10.48 (9.27–11.69)
Normal BMI	14541	−0.04 ± 0.98	−0.03 ± 0.97	16.97 (16.36–17.58)	15913	−0.01 ± 1.01	−0.02 ± 0.0.97	16.31 (15.74–16.88)
High BMI^#	6116	0.21 ± 0.99	0.18 ± 0.97	29.68 (28.54–30.82)	3831	0.24 ± 1.02	0.21 ± 0.98	27.80 (26.38–29.22)
		p < .01	p < .01	p < .01		p < .01	p < .01	p < .01

* Including thinness grade 1–3.

# Including overweight and obesity grade 1–3.