Circadian Levels of Serum Melatonin and Cortisol in relation to Changes in Mood, Sleep, and Neurocognitive Performance, Spanning a Year of Residence in Antarctica

Table 2

Psychological tests used in the study protocol and interpretation of scores.

S. no	Scale	Grading scale	Number of questions	Interpretation of score
1	DASS 42	0 = does not apply	42		Normal
		1 = applied to some degree		Depression	0–9
		2 = applied to a considerable degree		Anxiety	0–7
		3 = applied very much		Stress	0–14
		0 = would never doze		0–10 Normal range
2	ESS	1 = Slight chance	8	10–12 Borderline
		2 = Moderate chance		12–24 Abnormal
		3 = High chance of dozing
3	MEQ	Provides a “chronotype” of the individual	19	(1) Definitely Morning type = 64–56
				(2) Moderately morning type = 54–46
				(3) Neither type = 44–32
				(4) Moderately evening type = 30–22
				(5) Definitely evening type = 20–12
4	MMSE		30	Normal 27–30.

DASS-42: depression, anxiety, and stress scale; ESS: Epworth sleepiness scale; MEQ: Morningness Eveningness Questionnaire; MMSE: Mini mental status examination.