Table 1 Health and environmental outcomes
Outcome | Definition | Functional form | Device/tool | Timing of collection |
|---|---|---|---|---|
Clinical measures | ||||
 Anthropometrics | Weight (kg), height (m), waist circumference (cm) | Continuous | Seca 813 digital scale; stadiometer; measuring tape | Start of measurement week |
 Body composition | Body fat mass, body fat %, and fat free mass measured using BIA | Continuous | Quantum Legacy BIA Analyzer | Once per hot season |
 Blood pressure | Systolic and diastolic resting blood pressure (mmHg) measured in triplicate on two occasions | Continuous | Omron Automatic Digital Blood Pressure Monitor | Start of measurement week |
 Core body temperature | Internal body temperature (°C) estimated using thermal energy transfer | Continuous | CORE sensor | Continuous over 7-day period |
 Glucose | Fasting capillary blood glucose (mmol/L) | Continuous | AccuChek Instant Device | Start of measurement week |
 Physical activity | Acceleration counts per minute | Continuous | Actical accelerometer | Continuous over 7-day period |
 Sleep behaviour | Actigraphy-derived sleep behaviour (various parameters) | Continuous | Actiwatch Spectrum Plus | Continuous over 7-day period |
 Hydration status | Urine specific gravity, measure of number of solutes dissolved in urine as compared to water (1.000) | Continuous | Siemens Clinitek Status Analyzer | Start of measurement week |
 Kidney function | Albumin-to-creatinine ratios (mg/mmol categories) | Categorical | Siemens Clinitek Status Analyzer | Start of measurement week |
Questionnaires | ||||
 Depression | Responses to 20-item questionnaire rating depression symptom (0 to 3 for each item); scores ranging 0–60, higher scores indicate greater depressive symptoms | Categorical | Center for Epidemiologic Studies Depression Scale (CES-D) | Once per hot season |
 Drinking behaviour | Self-reported average amount and frequency of liquid consumption | Count | Adapted food frequency questionnaire | Start of measurement week |
 Mood | Self-reported questionnaire containing 2 10-item scales (positive and negative affect scores between 10–50). | Categorical | Positive and Negative Affect Scale (PANAS) | End of measurement week |
 Physical activity | Self-reported physical activity participation in three settings and sedentary behaviour in the past week (MET-minutes) | Categorical | Global Physical Activity Questionnaire (GPAQ) | Once per hot season |
 Sleep quality | Self-reported sleep quality during the past month. Global PSQI score ranging from 0 to 21. Higher scores indicate poorer sleep quality | Categorical | Pittsburgh Sleep Quality Index (PSQI) | End of measurement week |
 Excess daytime sleepiness | Responses to 8 items rated on 4-point Likert scale, total score 0–24 with higher number indicating a higher daytime sleepiness | Categorical | Epworth Sleepiness Scale (ESS) | End of measurement week |
 Thermal comfort | Rating of nocturnal thermal comfort on a 7–point Likert scale | Categorical | ASHRAE 7-point thermal sensation scale | During each night of the measurement week |
Indoor thermal conditions | ||||
 Air temperature | Ambient indoor air temperature (°C) | Continuous | DS1923 iButton Hygrochron heat and humidity measurement device | Continuous during the study period |
 Relative humidity | Water vapor present in the air compared with the total that can be held at a given temperature (%) | Continuous | DS1923 iButton Hygrochron heat and humidity measurement device | Continuous during the study period |
External meteorological conditions | ||||
 Air temperature | Ambient outdoor air temperature (°C) | Continuous | Automatic Weather Station | Continuous during the study period |
 Relative humidity | Water vapor present in the air compared with the total that can be held at a given temperature (%) | Continuous | Automatic Weather Station | Continuous during the study period |
 Wind speed | Hourly average air speed (m/s) | Continuous | Automatic Weather Station | Continuous during the study period |
 Sunshine | Hourly and total sunshine hours per day | Continuous | Automatic Weather Station | Continuous during the study period |
 Rainfall | Hourly amount of rainfall (mm) | Continuous | Automatic Weather Station | Continuous during the study period |
 Cloud cover | Portion of the sky (octas) covered by all types of cloud at the time of observation | Count | Observation | Daily during the study period |