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Table 3 Bivariate analysis—prevalence of reduced WAI and prevalence ratio according to work characteristics of Technical-Administrative Workers in Education at the Federal University of Juiz de Fora, Juiz de Fora, 2013 (N = 600)

From: Work ability and associated factors of Brazilian technical-administrative workers in education

Variables Total Reduced WAI PR 95 % CI p value
N (%) N (p/ %)
Number of jobs
 One 492 (83.8) 68 (13.8) 1   
 Two or more jobs 95 (16.2) 14 (14.7) 1.06 0.60–1.90 0.827
Weekly working hours
 ≤40 h 453 (78.5) 62 (13.7) 1   
 >40 h 124 (21.5) 16 (12.9) 0.94 0.54–1.63 0.834
Evening jobs
 No 472 (80.7) 62 (13.1) 1   
 Yes 113 (19.3) 18 (15.9) 0.98 0.92–1.04 0.471
Social support at work
 Strong social support 443 (76.5) 43 (9.7) 1   
 Low social support 136 (23.5) 38 (27.9) 2.88 1.86–4.45 0.000
Demand-control modela
 Low strain job 183 (32.1) 18 (9.8) 1   
 Active job 69 (12.1) 5 (7.2) 0.74 0.27–1.98 0.546
 Passive job 236 (41.3) 34 (14.4) 1.46 0.83–2.59 0.190
 High strain job 83 (14.5) 24 (28.9) 2.94 1.60–5.42 0.001
Contact with the public
 Indirect or no contact 109 (18.6) 7 (6.4) 1   
 Direct or direct and indirect 478 (81.4) 75 (15.7) 2.44 1.13–5.30 0.024
Type of work function
 Mixed 136 (23.1) 35 (25.7) 1   
 Physical 62 (10.5) 10 (16.1) 0.63 0.31–1.26 0.193
 Mental 392 (66.4) 37 (9.4) 0.37 0.23–0.58 0.000
  1. Differences in n totals are explained by the fact that some information regarding a few variables was lost. Data below 6 % not informed
  2. WAI work ability index, PR prevalence ratio
  3. 95 % CI: 95 % confidence interval
  4. a Karasek, 1979
  5. Source: The author, 2013