Table 4 Balance across the significant predictors of participation for the four incentive conditions (Groups 1 to 4)
Group 1 | Group 2 | Group 3 | Group 4 | ||
|---|---|---|---|---|---|
no reward n(%) | 25 prizes of £20 n(%) | one £500 prize n(%) | £10 reward on receipt of completed questionnaire n(%) | Total N | |
Total N | 1448 | 1267 | 1491 | 4224 | 8430 |
Gender (NS 1 ) | |||||
male | 687 (47.4) | 638 (50.4) | 687 (46.1) | 2033 (48.1) | 4045 |
female | 713 (49.2) | 590 (46.6) | 747 (50.1) | 2019 (47.8) | 4069 |
missing data | 48 (3.3) | 39 (3.1) | 57 (3.8) | 172 (4.1) | 316 |
Father manual versus non manual worker (NS 1 ) | |||||
non-manual | 517 (35.7) | 417 (32.9) | 511 (34.3) | 1411 (33.4) | 2856 |
manual | 493 (34.0) | 441 (34.8) | 510 (34.2) | 1410 (33.4) | 2854 |
missing data | 438 (30.2) | 409 (32.3) | 470 (31.5) | 1403 (33.2) | 2720 |
Mother manual versus non manual worker (NS 1 ) | |||||
non-manual | 604 (41.7) | 511 (40.3) | 618 (41.4) | 1777 (42.1) | 3510 |
manual | 343 (23.7) | 277 (21.9) | 324 (21.7) | 953 (22.6) | 1897 |
missing data | 501 (34.6) | 479 (37.8) | 549 (36.8) | 1494 (35.4) | 3023 |
Family composition (NS 1 ) | |||||
lives with both parents | 960 (66.3) | 829 (65.4) | 1016 (68.1) | 2791 (66.1) | 5596 |
lives with mum only | 375 (25.9) | 328 (25.9) | 329 (22.1) | 1027 (24.3) | 2059 |
lives with dad only | 50 (3.5) | 54 (4.3) | 54 (3.6) | 149 (3.5) | 307 |
lives with neither parent | 12 (0.8) | 12 (0.9) | 22 (1.5) | 57 (1.3) | 103 |
missing data | 51 (3.5) | 44 (3.5) | 70 (4.7) | 200 (4.7) | 365 |
Parental monitoring (NS 1 ) | |||||
high parental monitoring | 652 (46.6) | 513 (41.8) | 649 (45.3) | 1858 (45.9) | 3672 |
low parental monitoring | 748 (53.4) | 715 (58.2) | 785 (54.7) | 2194 (54.1) | 4442 |
Pocket Money (NS 1 ) | |||||
less than £20 per week | 681 (48.6) | 528 (43.0) | 687 (47.9) | 1790 (44.2) | 3686 |
more than £20 per week | 719 (51.4) | 700 (57.0) | 747 (52.1) | 2262 (55.8) | 4428 |
Sexual intercourse by 16 years of age (NS 1 ) | |||||
has had sexual intercourse | 373 (36.6) | 334 (37.4) | 404 (37.4) | 1057 (36.9) | 2168 |
has not had sexual intercourse | 637 (62.4) | 544 (60.9) | 666 (61.7) | 1767 (61.7) | 3614 |
missing data | 8 (0.8) | 15 (1.7) | 10 (0.9) | 39 (1.4) | 72 |
Early school leaving status (NS 1 ) | |||||
non-leavers | 1053 (72.7) | 874 (69.0) | 1135 (76.1) | 3054 (72.3) | 6116 |
leavers | 395 (27.3) | 393 (31.0) | 356 (23.9) | 1170 (27.7) | 2314 |
Drunkenness (NS 1 ) | |||||
never or rarely gets drunk | 867 (59.9) | 687 (54.2) | 761 (51.0) | 2430 (57.5) | 4745 |
gets drunk once a month or more | 481 (33.2) | 486 (38.4) | 466 (31.3) | 1309 (31.0) | 2742 |
Missing data | 100 (6.9) | 94 (7.4) | 264 (17.7) | 485 (11.5) | 943 |