Table 1. Predictor variables and their measurements.

Variable (type)	Measurement
Age (continuous)	Captured in years.
Sex (nominal)	Entered as male or female.
Marital status (nominal)	Assessed in three levels: single, married or others (widowed, divorced and separated).
BMI (continuous)	The body mass index (BMI) was determined by dividing weight in kilogrammes by height in metres squared.
School (nominal)	The institutional entity of the CHS where the teaching staff is based (including the specific department). Grouped into five levels: SOM (+UNITID & EAKI), SOPharm, SON, SDS, SPH (+CHIVPR).
Level of education (ordinal)	The level of university training attained by the teaching staff. Assessed in three levels: Bachelors, Masters or PhD.
Physical exercise (ordinal)	Physical exercise entails engaging in any of the following activities by the teaching staff: walking, running, cycling, swimming, jogging, back exercise and playing games e.g. football. This was graded in three levels according to the duration of continuous activity per day and frequency per week 24: grade 1 or never (frequency less than once a week); grade 2/rare (1 or 2 days per week for a minimum of 30 minutes each day); grade 3/regular (at least 3 days per week for a minimum of 30 min each day).
Tobacco use (nominal)	Either by smoking or chewing and assessed either as user or non-user
Level of alcohol intake (ordinal)	This represents the amount of alcohol that is consumed by the teaching staff per week. Classified into three categories based on the frequency of intake per week 24: grade 1 or non-consumer (less than once a week); grade 2/rare consumer (1-3 times in a week); grade 3/regular consumer (4-7 times per week).
Length of working day (continuous)	This constitutes the time during which the teaching staff is performing work-related duties.
Office chair design (nominal)	Assessed in two levels: with or without lumbar support.
Level of workplace stress (ordinal)	This refers to an uncomfortable feeling of nervousness or great worry caused by any difficult situation related to one’s work. Therefore, a stressor may be any physical or psychological threat to safety, status, or well-being; physical or psychological demands that exceed available resources; any unpredictable change in the work environment; or any inconsistency between expectations and outcomes. It was scaled into three levels: 1 = low; 2 = medium; 3 = high.
Workplace social support (ordinal)	The degree to which the teaching staff perceives that his/her well-being is valued by his colleagues (can be in form of material, emotional or informational support). It was categorized into four levels: 0 = absent, 1 = poor, 2 = ok/satisfactory or 3 = good.
Job satisfaction (ordinal)	The feeling of pleasure and achievement that the teaching staff experiences in his/her job when he/she knows that his/her work is worth doing, or the degree to which his/her work gives him/her this feeling. It was categorized into three levels: 1 = dissatisfied, 2 = neutral or 3 = satisfied.