| Respondents | Non-respondents | Telephone number unavailablea | Total | p-value | Total n in each group included in analysis |
---|---|---|---|---|---|---|
n (%) | n (%) | n (%) | n (%) | Â | (n/n/n) | |
Total n in population | 977 | 2305 | 1173 | 4455 | Â | Â |
Year of birth | Â | Â | Â | Â | Â | 977/2305/1173 |
 1993 | 349 (40.58) | 658 (28.55) | 349 (35.72) | 1483 (33.29) |  | |
 1994 | 320 (31.97) | 788 (34.19) | 320 (32.75) | 1483 (33.29) |  | |
 1995 | 308 (27.45) | 859 (37.27) | 308 (31.53) | 1489 (22.42) | <0.0001 | |
Etnicity | Â | Â | Â | Â | Â | 954/2249/1078 |
 Danish | 879 (92.14) | 1974 (87.77) | 924 (85.71) | 3777 (88.23) |  | |
 Other | 75 (7.86) | 275 (12.23) | 154 (14.29) | 504 (11.77) | <0.0001 | |
Urbanisation | Â | Â | Â | Â | Â | 977/2305/1173 |
 Dense | 224 (22.93) | 370 (16.05) | 290 (24.72) | 884 (19.84) |  | |
 Intermediate | 102 (10.44) | 282 (12.23) | 144 (12.28) | 528 (11.85) |  | |
 Thinly pop. | 651 (66.63) | 1653 (71.71) | 739 (63.00) | 3043 (68.31) | <0.0001 | |
Educational level (completed)b | Â | Â | Â | Â | Â | 931/2196/1036 |
 I + II + III + IV | 359 (38.56) | 633 (28.76) | 432 (41.70) | 1424 (34.17) |  | |
 V | 572 (61.44) | 1563 (71.24) | 604 (58.30) | 2739 (65.83) | <0.0001 | |
Parents educational levelbd | Â | Â | Â | Â | Â | 930/2173/1022 |
 I | 37 (3.98) | 88 (4.05) | 31 (3.03) | 156 (3.78) |  | |
 II | 118 (12.69) | 230 (10.58) | 114 (11.15) | 462 (11.20) |  | |
 III | 35 (3.76) | 79 (3.64) | 38 (3.72) | 152 (3.68) |  | |
 IV | 477 (51.29) | 1044 (48.04) | 455 (44.52) | 1976 (47.90) |  | |
 V | 263 (28.28) | 732 (33.69) | 384 (37.57) | 4125 (33.43) | 0.0050 | |
Number of primary care contacts in the previous yearc | Â | Â | Â | Â | Â | 977/2305/1173 |
 0 | 83 (8.50) | 228 (9.89) | 204 (17.39) | 515 (11.56) |  | |
 1–10 | 497 (50.87) | 1133 (49.15) | 508 (43.31) | 2138 (47.99) |  | |
 11–20 | 221 (22.62) | 532 (23.08) | 255 (21.74) | 1008 (22.63) |  | |
 >20 | 176 (18.01) | 412 (17.87) | 206 (17.56) | 794 (17.82) | <0.0001 |