Table 3.

Analysis of effects of gender, BMI and gender × BMI on errors of self-reported body weight (kg).

Gender	BMI	n	Mean	SE	95% CI of mean (L)	95% CI of mean (U)	p	Significancea
Male		838	− 0.41	0.14	− 0.68	− 0.14	< 0.001	A
Female		83	− 2.76	0.63	− 4.00	− 1.53		B
	Mid + U	364	0.24	0.29	− 0.32	0.81	< 0.001	A
	Over	270	− 1.10	0.44	− 1.96	− 0.24		B
	Severe	287	− 3.90	0.81	− 5.49	− 2.31		C
Male	Mid + U	312	0.82	0.15	0.52	1.112	0.12
Male	Over	247	− 0.14	0.17	− 0.44	0.22
Male	Severe	282	− 1.24	0.16	− 1.55	− 0.93
Female	Mid + U	55	− 0.32	0.35	− 1.01	0.38
Female	Over	22	− 1.74	0.56	− 2.84	− 0.64
Female	Severe	6	− 6.23	1.07	− 8.33	− 4.12

^aMeans in the same variable category with different letters were significantly different.