Table 4.

Age-adjusted prevalence in the report of dieting and unhealthy weight-control behaviours and comparison between Barcelona and the Twin Cities by weight status in boys

	Dieting				Any less extreme UWCB				Any extreme UWCB
	BCN (%)	TC (%)	PR	p	BCN (%)	TC (%)	PR	p	BCN (%)	TC (%)	PR	p
Weight status
Underweight	3.5	0.0	–	–	3.9	26.7	6.9	0.007	0.0	0.0	–	–
Normal weight	8.4	15.4	1.8	<0.001	8.5	22.8	2.7	<0.001	0.8	3.0	3.7	0.011
Overweight	49.6	43.9	0.9	0.302	27.5	53.3	1.9	<0.001	1.9	2.4	1.3	0.739
Obesity	75.6	61.3	0.8	0.109	68.1	61.6	0.9	0.550	0.0	7.0	–	–
Trend*	3.01	2.00			2.66	1.40			2.34	1.54
p-value†	<0.001	<0.001			<0.001	0.007			0.315	0.009
Ratio of trends, R‡	0.66				0.53				0.66
p-value for R§	0.034				0.004				0.626

Note:

UWCB, unhealthy weight-control behaviours; BCN, Barcelona; TC, Twin Cities; PR, prevalence ratio within each category of weight status; p, p-value for prevalence ratio.

^*Trend across the four categories of weight status within each country is estimated as the exponentiated linear trend on the log-scale. Trend is across only three categories for any extreme UWCB in TC.

^†p-value tests the trend against no-trend (flat response) on the log-scale, within each country.

^‡Ratio of trends: ratio of the trend estimated for TC versus BCN.

^§p-value for R: tests whether this ratio differs from 1.