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Table 2 Characteristics of the sample and proportion of workdays lost to sick leave (SL)

From: Socioeconomic status and sick leave granted for mental and somatic disorders: a prospective study of young adult twins

   SL any SL somatic SL mental
  N Mean (SD) Mean (SD) Mean (SD)
Gender        
Male 2794 2.35 (6.24) 1.67 (5.06) 0.51 (3.00)
Female 3309 7.01 (9.96) 5.02 (8.14) 1.28 (4.51)
Year of birth (mean = 1972.43, SD = 3.71)      
1967-1970 2233 5.11 (8.36) 3.37 (6.22) 1.09 (4.03)
1971-1975 2330 5.07 (8.57) 3.77 (7.12) 0.93 (3.76)
1976-1979 1540 4.25 (9.59) 3.22 (8.18) 0.70 (3.95)
Educational attainment (mean = 3.96, SD = 1.40)     
1 Lower secondary 180 8.46 (12.83) 5.18 (8.89) 2.23 (6.96)
2 Upper secondary, basic 748 7.34 (10.06) 5.24 (8.69) 1.61 (4.68)
3 Upper secondary, final year 1987 5.23 (9.21) 3.90 (7.54) 0.91 (4.00)
4 Post-secondary non-tertiary 220 3.77 (7.70) 2.88 (6.56) 0.58 (3.52)
5 Undergraduate studies 2171 4.41 (8.09) 3.08 (6.50) 0.84 (3.50)
6 Master’s degree or higher 797 2.46 (6.01) 1.69 (4.62) 0.37 (2.81)
Income 2008 equivalent (mean = 376709 NOK, SD = 151151)   
0 – 99,999 NOK 201 4.86 (10.37) 3.29 (8.53) 1.29 (5.38)
100,000 – 199,999 NOK 485 5.43 (9.20) 3.82 (7.87) 1.33 (4.41)
200,000 – 299,999 NOK 998 7.38 (10.60) 5.21 (8.35) 1.47 (5.15)
300,000 – 399,999 NOK 2026 5.69 (9.17) 4.14 (7.51) 1.01 (4.08)
400,000 – 499,999 NOK 1318 3.93 (7.86) 2.78 (6.38) 0.75 (3.34)
500,000 – 599,999 NOK 581 2.49 (5.56) 1.86 (4.71) 0.30 (1.77)
600,000 – 699,999 NOK 261 1.27 (3.69) 0.68 (1.81) 0.21 (1.25)
Above 700,000 NOK 233 1.38 (3.74) 1.07 (3.49) 0.16 (0.87)
Total 6103 4.88 (8.77) 3.48 (7.10) 0.93 (3.91)
  1. SL granted for somatic disorders, mental disorders, and any disorder in percent. Average follow-up time is 6.57 years.
  2. Note: The mean income corresponds to approximately €45000 or $60000; 100000 NOK (Norwegian kroner) equals approximately €12000 or $16000.