Table 2.

Unadjusted associations of socio-demographic and lifestyle factors, Body Mass Index and Waist Circumference with blood pressure

	Boys						Girls
	Elevated BP1			Hypertension			Elevated BP1		Hypertension
	n	%2	P3	%2	P3	n	%2	P3	%2	P3
Area
Urban	707	46.6	0.69	4.4	0.90	825	29.0	0.0010	3.8	0.011
Rural	587	45.2		4.2		751	40.4		7.3
Household's economic level
Low	526	45.6		3.0		645	37.9		6.5
Intermediate	427	44.0	0.44	4.2	0.35	552	33.2	0.037	4.5	0.068
High	283	49.5		5.5		299	27.4		2.6
Attending school
Yes	893	44.1	0.079	4.2	0.73	1151	30.6	0.0012	4.1	0.003
No	399	50.8		4.7		421	41.2		8.3
Proportion of low physical activity
1st tertile (low)	562	44.5		2.3		283	30.3		5.6
2nd tertile (middle)	413	46.3	0.56	5.0	0.0096	543	31.6	0.18	3.6	0.13
3rd tertile (high)	319	49.0		7.4		750	36.0		6.1
Perceived stress
1st tertile (low)	473	44.6		4.0		504	33.3		5.8
2nd tertile (middle)	474	47.0	0.82	5.6	0.30	566	35.8	0.33	3.8	0.25
3rd tertile (high)	341	46.1		3.0		500	30.6		5.9
Body Mass Index
No excess weight	1011	39.6		2.7		1161	28.9		3.3
Overweight	218	65.9	< 10-4	4.8	< 10-4	337	43.5	< 10-4	8.7	< 10-4
Obesity	65	74.4		26.0		78	52.8		15.3
Waist Circumference
1st tertile	496	31.6		2.5		632	23.8		3.5
2nd tertile	433	43.9	< 10-4	1.4	< 10-4	468	32.6	< 10-4	3.5	< 10-3
3rd tertile	358	64.1		9.7		471	44.8		8.7

1-Blood Pressure

2-Weighted prevalences (accounting for unequal probabilities of selection and/or differential response rates)

3-P-value for unadjusted association between elevated BP or hypertension and variable in left column