Table 6. Average PTSSC-15 score (grade, gender, and breakfast consumption) in 2011 and 2012.

	Grade group	Gender	Eating breakfast								F	P value
			Yes				No
			M	SD	N		M	SD	N
2011	Kindergartners									Gender × breakfast consumption	0.4711	ns
		Male	14.1	11.5	110		35.4	13.5	5	Breakfast consumption	4.976	<0.05
		Female	15.3	12.7	120		20.5	10.1	4	Gender	0.073	ns
	1st–3rd grade									Gender × breakfast consumption	1.217	ns
		Male	17.1	12.6	1741		22.5	13.8	79	Breakfast consumption	25.75	<0.0001
		Female	18.0	12.7	1616		23.9	14.7	69	Gender	0.438	ns
	4th–6th grade									Gender × breakfast consumption	0.520	ns
		Male	18.9	13.9	1826		26.3	17.2	142	Breakfast consumption	36.07	<0.0001
		Female	21.1	14.5	1870		30.5	15.9	95	Gender	1.942	ns
	7th–9th grade									Gender × breakfast consumption	0.560	ns
		Male	20.9	14.7	1725		24.6	15.7	244	Breakfast consumption	27.47	<0.0001
		Female	24.9	15.2	1665		33.3	16.5	189	Gender	18.66	<0.0001
2012	Kindergartners									Gender × breakfast consumption	0.4711	ns
		Male	12.4	11.3	105		24.3	9.8	4	Breakfast consumption	4.976	<0.05
		Female	14.1	12.6	121		20.4	7.9	5	Gender	0.073	ns
	1st–3rd grade									Gender × breakfast consumption	1.217	ns
		Male	16.1	12.6	1554		23.1	14.9	77	Breakfast consumption	25.75	<0.0001
		Female	16.6	12.5	1523		21.1	14.2	56	Gender	0.438	ns
	4th–6th grade									Gender × breakfast consumption	0.520	ns
		Male	17.5	13.6	1678		23.0	16.2	108	Breakfast consumption	36.07	<0.0001
		Female	18.2	13.8	1712		25.2	15.8	82	Gender	1.942	ns
	7th–9th grade									Gender × breakfast consumption	0.560	ns
		Male	19.0	13.6	1568		24.2	15.9	192	Breakfast consumption	27.47	<0.0001
		Female	23.4	14.6	1667		27.3	16.6	121	Gender	18.66	<0.0001

M, mean; SD, standard deviation; N, number of cases.