Table 2

Covariate adjusted hazard ratio table
Covariate HR1 95% CI p-value HRCovariate-adjusted2 Change3 % Change4
High distress [age adj.] 1.33 1.10-1.61 0.003 - - -
Sociodemographic factors
Age 1.04 1.03-1.04 <0.001 1.33 - -
Female sex [ref male] 0.74 0.62-0.90 0.002 1.37 0.030 10.36
Marital status [ref unmarried] 1.18 0.96-1.45 0.120 1.34 0.006 2.25
Lower education [ref medium] 1.29 1.02-1.64 0.037 1.29 −0.028 −9.37
Higher education [ref lower] 0.80 0.62-1.03 0.084
Race/ethnicity [ref white] 2.63 1.27-4.02 <0.001 1.33 −0.003 −0.95
Annual household income <15,000 [ref 15,000 - <35,000] 1.10 0.89-1.35 0.398 1.31 −0.013 −4.52
Annual household income ≥ 35,000 [ref 15,000 - <35,000] 0.60 0.39-0.91 0.016
Health
More energetic [ref same energy] 0.74 0.59-0.93 0.009 1.14 −0.155 −54.25
Less energy [ref same energy] 2.09 1.65-2.66 <0.001
Health status [ref ‘no’] 2.36 1.88-2.95 <0.001 1.19 −0.114 −39.90
One/some health problems [ref ‘none’] 1.70 1.38-2.10 <0.001 1.26 −0.055 −19.20
Lifestyle
Inactive/sedentary [ref moderately active] 0.95 0.74-1.23 0.698 1.31 −0.013 −4.54
Active [ref moderately active] 0.72 0.57-0.89 0.003
Smoking [ref no] 1.17 0.95-1.44 0.137 1.32 −0.006 −2.21
Additional analysis5
BMI [kg/m2] 1.12 1.11-1.14 <0.001 1.29 0.013 5.38
BMI category ≤ 18.5 [ref 18.5-24.9] 2.19 0.95-5.06 0.065 1.29 0.009 3.61
BMI category 25.0-29.9 [ref 18.5-24.9] 2.09 1.55-2.81 <0.001
BMI category ≥ 30 [ref 18.5-24.9] 6.13 4.61-8.14 <0.001

1 The HR of each individual covariate is reported, adjusted for high distress and age. Health status and health problems are additionally adjusted for time dependent interactions (not shown).

2 The ‘HRcovariate adjusted’ is the HR of high distress, adjusted for age and each covariate independently.

3 Change in the strength (logHR) of association of high distress before and after each covariate adjustment = Change in logHR = (Bcrude model – Bnew model), and B = logHR.

4 The percentage change = 100*(Change in logHR)/Bcrude model. Absolute changes >1% were considered relevant, and included in subsequent multivariate regression models.

5 Information on BMI was not available until wave 13, and separate analysis were done for BMI, based on 452 diabetes events and 4780 cases. The age adjusted HR of high distress was 1.28 (95% CI = 1.03-1.57, p = .023) in that sample size.

Mommersteeg et al.

Mommersteeg et al. BMC Public Health 2012 12:1109   doi:10.1186/1471-2458-12-1109

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