Table 1

Demographics of the final sample and detail by wave

Total*NU1 NU2NU3
N invited4156†841†2240†3374†
% females (95% CI)50.5% (48.9 to 52.1)54.8% (51.4 to 58.2)50.4% (48.3 to 52.4)49.7% (48.0 to 51.4)
N completed (response rate)2773 (67%)373 (44%)665 (30%)2151 (64%)
Mean age (SD) (range)26.1 (4.1) (18.7–38.6)24.7 (3.3) (18.4–30.4)27.4 (2.9) (20.6–38.6)25.7 (4.3) (18.7–38.3)
% females (95% CI)57.8% (55.9 to 59.6)62.9% (57.7 to 67.8)58.2% (54.3 to 62.0)57.6% (55.4 to 60.0)
Marital status % (n)NA‡
 Married21.6% (599)28.1% (187)19.4% (418)
 Separated1.0% (28)0.9% (6)1.1% (23)
 Divorced1.0% (28)1.4% (9)0.9% (20)
 Widowed0.1% (3)0.1% (3)
 Never married76.3% (2115)69.6% (463)78.4% (1687)
Have children % (95% CI)18.3% (16.9 to 19.8)NA‡22.1% (19.0 to 25.5)17.3% (15.7 to 19.0)
Highest education level§ % (n)NA‡
 No formal education0.0% (1)0.0% (0)0.05% (1)
 Primary school0.0% (0)0.0% (0)0.0% (0)
 Junior secondary school1.8% (51)1.5% (10)2.1% (45)
 Senior secondary school16.2% (449)14.4% (96)16.9% (364)
 Certificate or diploma24.3% (675)29.3% (195)23.2% (498)
 Degree44.7% (1239)39.5% (263)45.7% (983)
 Postgraduate diploma, masters, PhD12.8% (354)15.2% (101)11.9% (256)
 Don’t know/prefer not to answer0.1% (4)0.0% (0)0.18% (4)
  • *NU1 data is in part reported in ref.,1 but not included in the total sample or used in this analysis as most of the participants (345 out of 373: 92%) later completed NU2 or NU3.

  • †4156 unique individuals were invited to participate in the 19Up, but some were invited in several waves. Participants invited in NU1 were all reinvited in NU2. They were also invited as part of NU3 if they had not completed NU2 and not refused to be recontacted. Forty participants of NU2 also completed NU3.

  • ‡Succinct demographics for NU1 were collected as part of a different study on political views and economical games and different questions were used.

  • §Participants were asked about their highest level of education (completed or partially completed) at the time of questionnaire.

  • 19Up, Nineteen and Up study.