Table 2.

Description of schoolchildren’s sample and response rates by grade group and country

Country	Grade group									Total
	11-year olds			13-year olds			16-year olds
	N1	n2	R.R3	N1	n2	R.R3	N1	n2	R.R3	N1	n2	R.R3
Albania	1652	1186	71.79	1667	1204	72.23	1125	937	83.29	4444	3327	74.86
Bulgaria	1241	662	53.34	1105	685	61.99	1273	693	54.44	3619	2040	56.37
B & H	1333	676	50.71	1340	675	50.37	1501	1287	85.74	4174	2638	63.20
Croatia	1744	1223	70.13	1771	1188	67.08	1492	1233	82.64	5007	3644	72.78
Greece	4401	2771	62.96	5072	3438	67.78	5847	4242	72.55	15,320	10,451	68.22
FYROM	2058	670	32.56	2183	791	36.23	1408	1125	79.90	5649	2586	45.78
Romania	3471	1976	56.93	2709	1849	68.25	2190	2130	97.26	8370	5955	71.15
Serbia	2131	908	42.61	2623	1400	53.37	2811	1719	61.15	7565	4027	53.23
Turkey	2913	2500	85.82	3162	2564	81.09	3027	2462	81.33	9102	7526	82.69
Total	20,944	12,572	60.03	21,632	13,794	63.77	20,674	15,828	76.56	63,250	42,194	66.71

¹N: number of children registered to schools that were included in the sample

²n: number of children who accepted to participate by filling in the ICAST-C questionnaire

³R.R.: response rate (percentage of the children who accepted to participate, out of the total number of invited school children in the selected school)