Table 3.

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

	Dieting				Any less extreme UWCB				Any extreme UWCB
	BCN (%)	TC (%)	PR	p	BCN (%)	TC (%)	PR	p	BCN (%)	TC (%)	PR	p
Weight status
Underweight	7.8	18.1	2.3	0.369	9.4	18.1	1.9	0.477	1.7	0.0	–	–
Normal weight	30.2	31.5	1.0	0.636	24.6	38.1	1.6	<0.001	4.1	3.9	0.9	0.809
Overweight	58.7	60.7	1.0	0.711	47.5	59.1	1.3	0.031	13.8	7.2	0.5	0.035
Obesity	82.6	76.9	0.9	0.606	50.1	74.1	1.5	0.142	13.0	14.1	1.1	0.905
Trend*	2.17	1.65			1.76	1.60			2.09	1.91
p-value†	<0.001	0.041			<0.001	0.056			0.047	<0.001
Ratio of trends, R‡	0.76				0.91				0.91
p-value for R§	0.334				0.730				0.814

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.