Table 5. Results from logit regression models of respondent weight overestimation (log-odd estimates and s.e.).

Weight overestimation	Model I				Model II				Model III
	Women		Men		Women		Men		Women		Men
	Coef.	s.e.	Coef.	s.e.	Coef.	s.e.	Coef.	s.e.	Coef.	s.e.	Coef.	s.e.
Constant	1.347	0.94	2.369	1.61	1.296	0.95	2.221	1.56	1.290	0.96	0.737	0.67
BMI	−0.093	0.02***	−0.110	0.06+	−0.093	0.02***	−0.108	0.06+	−0.093	0.02***	−0.049	0.02*
Age (years)	−0.029	0.03	−0.094	0.05*	−0.028	0.03	−0.097	0.05*	−0.030	0.03	−0.039	0.02*
Primary education	Referent		Referent		Referent		Referent		Referent		Referent
Secondary education	−0.145	0.35	−0.109	0.42	−0.150	0.34	−0.112	0.42	−0.166	0.35	−0.047	0.21
Vocational education	0.334	0.36	−0.645	0.51	0.318	0.36	−0.671	0.52	0.319	0.36	−0.285	0.23
Short-term higher education	−0.390	0.47	−0.419	0.67	−0.391	0.48	−0.364	0.67	−0.391	0.48	−0.186	0.30
Middle-term higher education	−0.040	0.35	−0.491	0.58	−0.070	0.35	−0.497	0.58	−0.074	0.35	−0.234	0.26
Long-term higher education	−0.182	0.40	−0.257	0.70	−0.188	0.40	−0.170	0.69	−0.188	0.40	−0.100	0.31
Relationship status	−0.226	0.21	0.953	0.37*	−0.206	0.22	0.948	0.37*	−0.217	0.22	0.428	0.17*
Age difference <6 years	0.221	0.18	−0.323	0.32	0.219	0.18	−0.333	0.30	0.194	0.17	−0.148	0.12
Grew up together	−0.456	0.21*	−0.354	0.40	−0.435	0.21*	−0.344	0.40	−0.440	0.20*	−0.167	0.17
Number of siblings	0.007	0.17	−0.113	0.20	−0.000	0.17	−0.111	0.20	−0.009	0.16	−0.081	0.09
Brother	−0.074	0.17	−0.064	0.30	−0.004	0.17	−0.100	0.31	0.199	0.20	−0.106	0.15
Sibling BMI	−0.052	0.02*	−0.024	0.04	−0.039	0.03	−0.040	0.04	−0.050	0.03	−0.008	0.02
Sibling BMI*brother									0.036	0.05	−0.016	0.04
Sibling underestimation					−0.270	0.26	0.528	0.37	−0.284	0.58	0.114	0.31
Sibling underestimation*brother									−0.266	0.66	−0.033	0.38
Sibling overestimation					0.372	0.30	0.571	0.44	0.786	0.34*	−0.166	0.26
Sibling overestimation*brother									−1.375	0.72+	0.771	0.50
Number of observations	1542		1444		1542		1444		1542		1444
Log likelihood	−540.03		−233.72		−538.30		−232.08		−533.44		−231.56

Abbreviations: BMI, body mass index (calculated as kg m⁻²); Coef, coefficient.

Significance level: + at 10%, * at 5%, ** at 1% and *** at 0.01%. Standard errors are adjusted for sibling clustering.