Table 1

Baseline sociodemographic characteristics of recruited (N=444) and analysed (N=249) samples of SCOTS participants

CharacteristicRecruited sampleAnalysed sample*
N=444N=249
Sex, N (%)Male123 (27.7)72 (28.9)
Female321 (72.3)177 (71.1)
Missing00
Age (years)Mean (SD)46.2 (9.1)45.9 (9.1)
Missing00
Age group, N (%)<35 years61 (13.7)36 (14.5)
35–44 years116 (26.1)63 (25.3)
45–49 years109 (24.5)63 (25.3)
50–54 years79 (17.8)43 (17.3)
55+ years79 (17.8)44 (17.7)
Missing00
BMI (kg/m2)Median (Q1; Q3)47.2 (42.7; 53.6)47.6 (42.8; 53.8)
Missing10
BMI group, N (%)<4052 (11.7)24 (9.6)
40–44115 (26.0)64 (25.7)
45–49116 (26.2)64 (25.7)
50–5471 (16.0)44 (17.7)
55+89 (20.1)53 (21.3)
Missing10
SIMD quintile, N (%)1 (most deprived)135 (30.5)70 (28.3)
2108 (24.4)65 (26.3)
384 (19.0)51 (20.6)
468 (15.4)34 (13.8)
5 (least deprived)47 (10.6)27 (10.9)
Missing22
Marital status, N (%)Married/civil partnership/co-habitingNot collected155 (63)
Single/separated/divorced/widowed91 (37)
Missing3
Ethnic group, N (%)WhiteNot collected243 (97.6)
Mixed4 (1.6)
Asian/Asian Scottish/Asian British1 (0.4)
African Caribbean/Black1 (0.4)
Other0 (0.0)
Missing0
Education, N (%)School onlyNot collected58 (23.5)
Formal qualifications through training at work54 (21.9)
Qualification (other than a degree from college or university)64 (25.9)
Degree from college or university71 (28.7)
Missing2
Current employment status, N (%)Working full timeNot collected124 (50.0)
Working part time24 (9.7)
Unable to work because of illness or disability64 (25.8)
Student/unemployed and seeking employment/unemployed and not seeking employment/carer/other36 (14.5)
Missing1
  • Working full time: ≥ 30 hours per week; working part time: < 30 hours per week. Percentages may not total 100% in all cases due to rounding.

  • *Participants who returned baseline questionnaires prior to their bariatric surgery are included in the analysed sample.

  • BMI, body mass index; SCOTS, SurgiCal Obesity Treatment Study.