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Table 2 Overview of the study parameters, measurement methods and instruments

From: Klokwerk + study protocol: An observational study to the effects of night–shift work on body weight and infection susceptibility and the mechanisms underlying these health effects

Parameter Specification Measurement method Instrument Source
Primary study parameters    
(Night−) shift worka −Shift system Questionnaire Nightingale study questionnaire Pijpe et al. 2014
−Cumulative exposure
−Shift intensity
Body weighta −Body height Anthropometry Direct body height, weight, and waist circumference measurements  
−Body weight
−Waist circumference
Infection susceptibility −Influenza like illness Daily log (app) Mobile phone application  
−Acute respiratory infection
Secondary study parameters    
Sleep factorsa −Sleep quantity Questionnaire; MOS Sleep Scale; Hays et al. 2005
−Sleep quality Actigraphy Actigraphy devices
−Sleeping pattern
Physical activitya −Duration Questionnaire; SQUASH; Wendel−Vos et al. 2003; Chau et al. 2011
−Frequency Actigraphy WSQ;
−Intensity   Actigraphy devices
−Sedentary behavior
Diet behaviorsa −Timing of nutrition Food diary Food diary and FBCE Lennernäs & Andersson 1999
−Frequency of eating
−Snacking behavior
Light exposurea −Artificial light exposure Light sensor HOBO Pendant Light Data Logger  
−Sun light exposure
Vitamin D levela −Vitamin D level Blood sample analyses 25−hydroxyvitamin D analysis  
Immunological factorsa −mRNA Blood sample analyses Transcriptomics; Thelper subset and cytokine profile analysis  
−Cytokine profiles
Other study parameters    
Socio–demographic factorsa −Age Questionnaire Dutch Public Health Monitor GGD’en, CBS & RIVM, 2012
−Level of education
−Employment status
−Marital status
Smokinga −Smoking behavior Questionnaire Dutch Public Health Monitor GGD’en, CBS & RIVM, 2012
Alcohol usea −Alcohol use behavior Questionnaire Dutch Public Health Monitor GGD’en, CBS & RIVM, 2012
Job satisfaction −Job satisfaction Questionnaire TAS Smulders et al. 2001
Work−life balance −Work–life balance Questionnaire SWING Wagena & Geurts, 2000
Chronotypea −Morning/evening type Questionnaire MCTQ Roenneberg et al. 2003
Sickness absenteeism −Sickness absenteeism Questionnaire HPQ Kessler et al. 2003
  1. BMI body mass index, CBS statistics Netherlands, FBCE food–based classification of eating episodes, GGD community health service, HPQ heath and work performance questionnaire, MCTQ Munich chrono type questionnaire, MOS Sleep Scale medical outcomes study sleep scale, RIVM national institute for public health and the environment, SQUASH short questionnaire to asses health enhancing physical activity, SWING survey work–home interference nijmeGen, TAS TNO work situation survey, WSQ workforce sitting questionnaire
  2. aStudy parameters that are also included in the Klokwerk study