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. Author manuscript; available in PMC: 2018 Apr 27.
Published in final edited form as: Int Arch Occup Environ Health. 2016 Jul 1;89(7):1111–1125. doi: 10.1007/s00420-016-1151-5

Table 4.

Multivariate associations between number of 24-h shifts in the past month and more demanding over the past years with systolic and diastolic blood pressures in 295 male firefighters who worked at fire stations and were not taking anti-hypertensive medications

Category Subcategory Systolic blood pressure (mm Hg)
Diastolic blood pressure (mm Hg)
Model 1: M (SE) Pairwise comparison (p value) Model 2: M (SE) Pairwise comparison (p value) Model 1: M (SE) Pairwise comparison (p value) Model 2: M (SE) Pairwise comparison (p value)
Number of 24-h shifts in the past month 0–6 114.9 (3.4) 0.076 115.2 (3.3) 0.099 77.5 (2.2) 0.048 77.7 (2.1) 0.068
8–11 (reference) 107.7 (2.3) Ref. 108.6 (2.2) Ref. 72.3 (1.5) Ref. 73.1 (1.4) Ref.
12–21 111.7 (0.7) 0.092 111.6 (0.7) 0.202 75.8 (0.4) 0.022 75.7 (0.4) 0.080
ANCOVA test: p values 0.141 0.229 0.048 0.123
 0–6 115.0 (3.4) 0.076 115.3 (3.3) 0.099 77.5 (2.2) 0.048 77.7 (2.1) 0.068
 8–11 107.7 (2.3) Ref. 108.6 (2.2) Ref. 72.3 (1.4) Ref. 73.1 (1.4) Ref.
 12 110.5 (1.4) 0.289 110.8 (1.4) 0.418 75.5 (0.9) 0.061 75.7 (0.9) 0.118
 13 111.2 (1.9) 0.227 111.3 (1.9) 0.359 74.9 (1.2) 0.165 74.9 (1.2) 0.317
 14 112.9 (1.3) 0.050 113.0 (1.3) 0.091 76.3 (0.9) 0.017 76.5 (0.8) 0.041
 15 111.3 (1.9) 0.227 110.8 (1.8) 0.460 73.6 (1.2) 0.495 73.2 (1.2) 0.979
 16 113.4 (1.9) 0.053 112.9 (1.9) 0.147 78.5 (1.2) 0.001 78.1 (1.2) 0.008
 17–21 109.4 (2.6) 0.619 108.4 (2.6) 0.949 75.6 (1.7) 0.128 74.8 (1.6) 0.446
ANCOVA test: p values 0.422 0.458 0.031 0.044
More demanding job over the past years Strongly disagree/disagree 109.6 (1.2) Ref. 109.2 (1.2) Ref. 74.8 (0.8) Ref. 74.8 (0.7) Ref.
Agree/strongly agree 112.3 (0.8) 0.058 112.3 (0.8) 0.059 75.9 (0.5) 0.229 75.9 (0.5) 0.235

Model 1: after controlling for age, education, and more demanding job over the past years (for the analysis of the number of 24-h shifts in the past month) or more demanding over the past years (for the analysis of more demanding job over the past years). Model 2: Model 1 plus additionally after controlling for body mass index

M mean, SE standard error, ANCOVA analysis of covariance, Ref. the reference group for pairwise comparisons