Table 2.

Descriptive statistics of numeric frequency counts by vague quantifier for each item

	Overall			Means (SDs) by vague quantifier response category
In the past 7 days, how many times…	Mean (SD)	Skew	Range	Never	Rarely	Sometimes	Often	Always
Negative items
…did you feel run down?	3.29 (3.28)	2.35	0–25	0.21 (0.62)	1.43 (1.52)	3.44 (2.45)	6.63 (3.74)	7.40 (4.61)
…did you have to push yourself to get things done because of your fatigue?	3.10 (3.31)	2.42	0–25	0.41 (1.02)	1.46 (2.45)	3.49 (2.09)	6.01 (4.08)	6.30 (3.30)
…did you have trouble sleeping?	2.92 (2.68)	1.20	0–20	0.17 (0.60)	1.16 (1.22)	3.31 (1.87)	5.20 (1.75)	6.67 (3.43)
…did you have trouble staying asleep?	2.74 (2.83)	1.64	0–21	0.27 (0.96)	1.19 (1.38)	3.33 (1.88)	5.49 (2.53)	7.15 (3.52)
…did you feel angry?	2.41 (3.31)	3.33	0–30	0.20 (0.87)	1.13 (1.29)	3.74 (3.30)	7.25 (5.12)	4.00 (2.92)
…did you feel like yelling at someone?	2.52 (5.34)	8.26	0–85	0.18 (0.91)	1.16 (2.06)	3.55 (2.39)	9.40 (11.64)	9.89 (11.03)
…did you feel depressed?	2.24 (3.65)	4.24	0–40	0.14 (0.66)	1.04 (1.03)	3.73 (2.59)	6.94 (5.96)	9.56 (6.36)
…did you feel lonely?	2.28 (3.63)	4.20	0–40	0.07 (0.35)	0.82 (0.95)	3.23 (2.47)	6.16 (5.37)	8.83 (5.06)
Positive items
…did you have enough energy to exercise strenuously?	2.77 (2.96)	2.41	0–28	0.53 (1.72)	1.41 (1.91)	2.76 (1.57)	4.62 (1.95)	7.18 (5.55)
…were you energetic?	4.43 (5.81)	9.43	0–99	0.90 (1.97)	1.82 (1.74)	3.64 (2.31)	6.96 (9.08)	7.93 (6.69)
…did you get enough sleep?	4.18 (2.51)	0.50	0–20	1.00 (1.96)	1.83 (1.48)	3.68 (1.76)	5.68 (2.00)	6.42 (1.77)
…was it easy for you to fall asleep?	4.24 (2.81)	1.60	0–32	0.63 (1.41)	1.90 (3.10)	3.63 (1.95)	5.84 (1.41)	6.62 (1.91)
…did you feel cheerful?	5.47 (4.61)	5.15	0–50	2.20 (2.86)	2.30 (1.66)	4.14 (3.71)	6.86 (4.56)	7.89 (5.86)
…did you feel hopeful?	5.49 (5.78)	5.76	0–64	1.30 (2.26)	1.63 (1.46)	3.93 (3.85)	6.54 (4.87)	9.12 (8.94)