Table 1

Subject characteristics: demographic, professional and health behaviour variables of the total sample, intervention group and control group at baseline

CharacteristicTotal (n=154)Intervention group (n=75)Control group (n=79)
Demographic variables
 Age (years)40.9 (±7.72)40.67.56 (±7.62)41.06 (±7.86)
 Males152 (99%)75 (100%)77 (97%)
 Education
  Low87 (57%)41 (55%)46 (58%)
  Middle33 (21%)19 (25%)14 (18%)
  Master's degree34 (22%)15 (20%)19 (24%)
Professional variables
 Professional status
  Team leader65 (42%)34 (45%)31 (39%)
  Team leader's deputy27 (18%)10 (13%)17 (22%)
  Group leader27 (18%)15 (20%)12 (15%)
  Other35 (23%)16 (21%)19 (24%)
 Leadership responsibility52.79 (81.49)49.79 (74.87)55.63 (97.70)
 Shift work95 (62%)49 (65%)46 (58%)
 Hours of overtime per month (h)1.47 (±4.22)1.61 (±4.58)1.34 (±3.88)
 Daily break time (min)36.8 (±10.41)37.2 (±10.76)36.2 (±10.35)
 Self-reported sick leave days
  087 (57%)43 (57%)44 (56%)
  1–1049 (32%)25 (33%)24 (30%)
  Over 1018 (12%)7 (9%)11 (14%)
KFZA work conditions
 Decision latitude3.70 (±0.71)3.68 (±0.73)3.72 (±0.68)
 Variety of work3.90 (±0.66)3.89 (±0.64)3.91 (±0.68)
 Task identity3.61 (±0.90)3.63 (±0.90)3.59 (±0.92)
 Social support3.80 (±0.69)3.76 (±0.71)3.83 (±0.67)
 Team work3.76 (±0.62)3.71 (±0.65)3.80 (±0.59)
 Work load, qualitative2.16 (±0.85)2.07 (±0.77)2.23 (±0.92)
 Work load, quantitative3.23 (±0.87)3.24 (±0.84)3.22 (±0.90)
 Interruption of work2.77 (±0.69)2.76 (±0.68)2.78 (±0.70)
 Environmental stress2.46 (±01.02)2.51 (±01.02)2.42 (±01.03)
 Information and co-determination3.46 (±0.73)3.41 (±0.77)3.50 (±0.68)
 Company benefits3.31 (±0.76)3.32 (±0.73)3.29 (±0.80)
Health status
 BMI27.97 (±4.10)28.40 (±4.55)27.56 (±3.61)
 Waist (cm)99.38 (±11.06)100.5 (±12.26)98.3 (±9.71)
 Hypertension RR
(≥140/90 mm Hg)
80 (52%)40 (53%)40 (51%)
Health behaviour
 Intensive sports
(hours per week)
1.32 (±2.04)1.32 (±2.13)1.32 (±1.96)
 Smoking behaviour
  Smoker44 (29%)17 (23%)27 (34%)
  Never smoked56 (36%)25 (34%)31 (39%)
  Stopped smoking54 (35%)33 (44%)21 (27%)
Sleeping behaviour
 No sleeping problems79 (51%)43 (66%)36 (52%)
 Some sleeping problems40 (26%)16 (25%)24 (35%)
 Major sleeping problems15 (10%)6 (9%)9 (13%)
  • Values are mean (±SD) or numbers (%).

  • KFZA, Kurz-Fragebogen zur Arbeitsanalyse (Short Questionnaire for Work Analysis).