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Table 4 Balance across the significant predictors of participation for the four incentive conditions (Groups 1 to 4)

From: Retaining young people in a longitudinal sexual health survey: a trial of strategies to maintain participation

  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
  1. 1 All results were NS at the 95% level of confidence.