. Author manuscript; available in PMC: 2018 Sep 1.

Published in final edited form as: Int J Eat Disord. 2017 Aug 2;50(9):1114–1118. doi: 10.1002/eat.22745

Table 1.

Sample characteristics by frequency of laxative misuse during the last month.

	Report Any Laxative Misuse¹	Did not Report Laxative Misuse¹	Total Sample	Test Statistics²
	n=571	n=1724	n=2295
Demographics
Age (years)	27.2±8.8	30.2±10.9	29.5±10.5	F(1,2293) = 35.5, p < .001, $η_{p}^{2} = .015$
% female	97.9% (n=558)	91.5% (n=1575)	93.1% (n=2133)	χ²(1,2292) = 27.4, p < .001, $η_{p}^{2} = .012$
% Caucasian	89.7% (n=505)	91.3% (n=1550)	90.9% (n=2055)	χ²(1,2261) = 0.9, p = .321, $η_{p}^{2} = .001$
Weight
Body mass index (BMI; kg/m²)	22.4±6.0	29.3±13.1	27.6±12.1	F(1,2293) = 150.3, p < .001, $η_{p}^{2} = .062$
Weight status				χ²(3,2295) = 164.6, p < .001, $η_{p}^{2} = .072$
Underweight (BMI<18)	18.4% (n=105)	13.6% (n=234)	14.8% (n=339)
Normal weight (18≤BMI<25)	62.9% (n=359)	44.0% (n=758)	48.7% (n=1117)
Overweight (25≤BMI<30)	10.7% (n=61)	6.4% (n=110)	7.5% (n=171)
Obese (BMI≥30)	8.1% (n=46)	36.2% (n=622)	29.1% (n=668)
Eating Disorder Diagnosis				χ²(3,2295) = 263.4, p < .001, $η_{p}^{2} = .11$
Anorexia nervosa	14.2% (n=81)	10.6% (n=183)	11.5% (n=264)
Bulimia nervosa	63.2% (n=361)	31.0% (n=535)	39.0% (n=896)
Binge-eating disorder	0.0% (n=0)	19.9% (n=343)	14.9% (n=343)
OSFED⁴	22.6% (n=129)	38.5% (n=663)	34.5% (n=792)
Eating Disorder Related Behaviors³
Binge-eating frequency	5.47±2.4	4.35±2.7	4.63±2.7	F(1,2254) = 77.7, p < .001, $η_{p}^{2} = .033$
Self-induced vomiting frequency	4.59±2.9	3.21±2.9	3.55±2.9	F(1,2264) = 98.0, p < .001, $η_{p}^{2} = .042$
Diuretic misuse frequency	2.02±2.0	1.17±0.9	1.38±1.3	F(1,2264) = 186.04, p < .001, $η_{p}^{2} = .076$

Notes:

During the last month,

Comparisions were conducted between participants who reported any laxative misuse versus no laxative misuse during the last month,

Range = 1 to 8 (1=never; 2=once a month or less; 3=several times a month; 4=once a week; 5=twice a week; 6=three to six times a week; 7=once a day; 8 = more than once a day),

⁴

Other Specified Feeding and Eating Disorder.