Table 4

Adjusted odds ratio (OR) and 95% confidence interval (CI) of children’s respiratory health associated with frequency of vegetable intake

		Vegetable intake in summer						Vegetable intake in winter
		Model 1			Model 3			Model 1			Model 3
Outcome variables of respiratory health	Risk factor variables categories	OR*	95% CI	p value	OR†	95% CI	p value	OR*	95% CI	p value	OR†	95% CI	p value
*OR adjusted for area, age and sex. †OR adjusted for all tested nutritional factors included simultaneously in the model and for area, age, sex, pets, indoor moisture, use of gas oven for heating, additional unvented gas heating, passive smoking, mother’s education, father’s occupation, parent’s allergy, respondent and overcrowding. p=p for trend.
			n=19753			n=16853			n=19709			n=16853
Winter cough	>4/week	1(ref)			1 (ref)			1 (ref)			1 (ref)
	2–4/week	1.15	1.06 to 1.24		1.07	0.97 to 1.18		0.90	0.81 to 1.01		0.86	0.75 to 0.97
	<2/week	1.49	1.30 to 1.72	<0.001	1.23	1.03 to 1.47	0.02	1.04	0.93 to 1.16	0.12	0.81	0.70 to 0.94	0.01
			n=19824			n=16895			n=19774			n=16895
Persistent cough	>4/week	1 (ref)			1 (ref)			1 (ref)			1 (ref)
	2–4/week	1.00	0.90 to 1.10		0.98	0.87 to 1.10		0.85	0.75 to 0.97		0.80	0.69 to 0.93
	<2/week	1.23	1.04 to 1.46	0.10	1.10	0.88 to 1.36	0.70	0.91	0.80 to 1.04	0.48	0.79	0.67 to 0.94	0.03
			n=19252			n=16471			n=19204			n=16471
Wheeze ever	>4/week	1 (ref)			1 (ref)			1 (ref)			1 (ref)
	2–4/week	1.02	0.95 to 1.11		0.97	0.88 to 1.06		1.00	0.90 to 1.11		1.00	0.88 to 1.13
	<2/week	1.17	1.02 to 1.33	0.05	1.07	0.90 to 1.26	0.87	1.09	0.98 to 1.22	0.03	1.03	0.89 to 1.18	0.58
			n=19495			n=16648			n=19449			n=16648
Current wheeze	>4/week	1 (ref)			1 (ref)			1 (ref)			1 (ref)
	2–4/week	0.93	0.83 to 1.04		0.90	0.79 to 1.03		0.83	0.71 to 0.96		0.87	0.73 to 1.04
	<2/week	1.08	0.89 to 1.31	0.87	1.05	0.82 to 1.34	0.60	0.87	0.74 to 1.01	0.20	0.85	0.70 to 1.03	0.16