Table 1.

Operational definitions of special variables

Variable	Definition	Reference	Response
Physical exercise	Physical exercise on a regular schedule either in the evening or morning, 30 minutes or more per day in no more than 2 sessions per day, during, before, or after meditation or yoga.	Siddiqui et al. (2010) [27]	Yes/No
Yoga/meditation	Meditation for 15 minutes or more per day and ≥3 months per year.	Prasad et al. (2011) [28] and mindfulness meditation method by University of Massachusetts Medical School [29]	Yes/No
Worship practice	Worship more than 20 minutes per day in no more than 2 sessions per day.	Salmoirago-Blotcher et al. (2011) [30]	Yes/No
Sleeping habit	Regular sleep every night and no reported sleep disturbances	Perry et al. (2013) [31]	Yes/No
Consumption of junk food	Use of ready-made foods more than once each day	Naeem (2012) [32]	Yes/No