Table 3. Average PTSSC-15 score (grade & gender & house damage).

Grade Group	Gender	House damage								F	p value
		Absent			Present
		M	SD	N	M		SD	N
Kindergartners									Gender×House damage	0.32	ns
	Male	14.94	12.80	95	16.50		11.63	24	House damage	1.67	ns
	Female	14.90	12.10	109	18.89		15.26	18	Gender	0.30	ns
1st – 3rd gradeelementaryschool students									Gender×House damage	0.26	ns
	Male	16.03	12.10	1130	19.49		13.39	712	House damage	54.63	<0.0001
	Female	17.06	12.44	1053	20.07		13.28	658	Gender	3.38	ns
4th – 6th gradeelementaryschool students									Gender×House damage	0.01	ns
	Male	18.90	14.00	1128	20.11		14.73	846	House damage	6.13	0.0134
	Female	21.12	14.38	1169	22.23		15.15	800	Gender	21.44	<0.0001
Junior highschool students									Gender×House damage	0.96	ns
	Male	20.67	14.71	1194		22.37	14.94	783	House damage	5.86	0.0155
	Female	25.48	15.40	1108	26.20		15.79	756	Gender	74.70	<0.0001

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