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Table 2 Associations of education and occupation with the global ability factor g

From: Contribution of IQ in young adulthood to the associations of education and occupation with cognitive ability in older age

  Model 1: adjusted for age, sex Model 2: adjusted for age, sex, pre-morbid IQ Model 3*: adjusted for age, sex, pre-morbid IQ, depression score
Mean g (95% CI) p-value partial eta2 Mean g (95% CI) p-value partial eta2 Mean g (95% CI) p-value partial eta2
Education   < 0.001 0.076   < 0.001 0.036   < 0.001 0.037
 ISCED 1/2 −0.26 (− 0.44, − 0.07)    − 0.13 (− 0.32, 0.06)    − 0.09 (− 0.29, 0.10)   
 ISCED 3/4 − 0.13 (− 0.24, − 0.02)    −0.10 (− 0.21, 0.02)    −0.09 (− 0.20, 0.03)   
 ISCED 5/6 0.37 (0.26, 0.48)    0.28 (0.17, 0.40)    0.30 (0.18, 0.41)   
Occupation   < 0.001 0.037   0.058 0.015   0.180 0.011
 Semi−/unskilled −0.18 (−0.42, 0.07)    −0.07 (− 0.31, 0.17)    0.06 (− 0.19, 0.31)   
 Skilled manual −0.19 (− 0.36, − 0.02)    −0.08 (− 0.25, 0.09)    0.08 (− 0.26, 0.10)   
 Skilled nonmanual 0.04 (−0.09, 0.16)    0.03 (−0.10, 0.15)    0.05 (−0.07, 0.18)   
 Managerial 0.28 (0.04, 0.51)    0.28 (0.05, 0.51)    0.20 (−0.03, 0.44)   
 Professional 0.27 (0.13, 0.41)    0.17 (0.03, 0.31)    0.18 (0.04, 0.33)   
  1. N = 623. Each of the two rows shows a separate ANCOVA model for education and occupation respectively with global ability factor g as dependent variable
  2. Mean g shows estimated marginal means (95% CI). Depression scores were log-transformed. ISCED, International Standard Classification of Education. *n = 581
  3. Model 1: ISCED 1/2 versus 3/4, 0.13 SD difference in g; ISCED 1/2 versus 5/6, 0.63 SD difference in g; ISCED 3/4 versus ISCED 5/6, 0.50 SD difference in g
  4. Model 2: ISCED 1/2 versus 3/4, 0.03 SD difference in g; ISCED 1/2 versus 5/6, 0.41 SD difference in g; ISCED 3/4 versus ISCED 5/6, 0.38 SD difference in g
  5. Model 3: ISCED 1/2 versus 3/4, 0.00 SD difference in g; ISCED 1/2 versus 5/6, 0.39 SD difference in g; ISCED 3/4 versus ISCED 5/6, 0.39 SD difference in g
  6. Model 1: Semi/unskilled versus skilled manual, 0.01 SD difference in g; versus skilled nonmanual, 0.22 SD difference in g; versus managerial, 0.46 SD difference in g; versus professional, 0.45 SD difference in g. Skilled manual versus skilled nonmanual, 0.22 SD difference in g; versus managerial, 0.47 SD difference in g; versus professional, 0.46 SD difference in g. Skilled nonmanual versus managerial, 0.24 SD difference in g; versus professional, 0.23 difference in g. Managerial versus professional, 0.01 SD difference in g
  7. Model 2: Semi/unskilled versus skilled manual, 0.01 SD difference in g; versus skilled nonmanual, 0.10 SD difference in g; versus managerial, 0.35 SD difference in g; versus professional, 0.24 SD difference in g. Skilled manual versus skilled nonmanual, 0.11 SD difference in g; versus managerial, 0.36 SD difference in g; versus professional, 0.25 SD difference in g. Skilled nonmanual versus managerial, 0.25 SD difference in g; versus professional, 0.25 difference in g. Managerial versus professional, 0.11 SD difference in g
  8. Model 3: Semi/unskilled versus skilled manual, 0.02 SD difference in g; versus skilled nonmanual, 0.01 SD difference in g; versus managerial, 0.14 SD difference in g; versus professional, 0.12 SD difference in g. Skilled manual versus skilled nonmanual, 0.03 SD difference in g; versus managerial, 0.12 SD difference in g; versus professional, 0.10 SD difference in g. Skilled nonmanual versus managerial, 0.15 SD difference in g; versus professional, 0.13 difference in g. Managerial versus professional, 0.02 SD difference in g
  9. For pairwise comparison p-values, see text