Table 1

Numbers of respondents and response rates (%) by age and sex (AHLS).

	1977	1979	1981	1983	1987	1989	1991	1993	1995	1997	1999	2001	2003
Age 12
Boys
Respondents (n)	369	491	483	450	414	406	426	399	395	427	442	351	368
Response rate (%)	90	88	88	85	81	76	77	73	78	76	79	72	69
Girls
Respondents (n)	341	540	514	440	367	430	399	437	424	440	407	425	390
Response rate (%)	91	90	92	91	83	82	82	84	86	87	85	82	75
Age 14
Boys
Respondents (n)	345	565	488	429	1128	361	1196	1203	1177	1168	1187	1251	1092
Response rate (%)	88	86	87	78	81	75	74	74	75	69	74	66	66
Girls
Respondents (n)	367	535	548	482	433	431	1337	1299	1301	1347	1313	1485	1245
Response rate (%)	94	91	92	86	90	90	86	86	85	84	85	79	78
Age 16
Boys
Respondents (n)	386	528	535	413	1183	362	1008	1168	1232	1126	1110	892	1003
Response rate (%)	85	83	85	75	77	70	68	70	72	68	68	62	59
Girls
Respondents (n)	347	579	529	509	1284	380	1272	1389	1469	1379	1333	1138	1296
Response rate (%)	89	91	91	91	89	82	86	87	88	87	85	82	79
Age 18
Boys
Respondents (n)	347	523	519	489	1134	328	893	1029	1071	1088	1112	774	570
Response rate (%)	83	78	81	75	69	63	61	66	67	60	63	53	50
Girls
Respondents (n)	330	512	524	509	1401	407	1103	1265	1313	1415	1315	976	797
Response rate (%)	88	85	88	87	84	80	82	83	86	83	80	76	74