Table 3

Mean differences (SD) and per cent (proportion of) agreement between and correlation coefficients (Spearman's ρ, r_s _s) for the associations between four different measures of alcohol intake during pregnancy (drinks/week): diary, interview_a(average/week), interview₇ (past week), and questionnaire^3-150. All differences calculated as: first method—second method mentioned. Aarhus, Denmark, 1998

	Number	Mean (SD)	P₀ ^3-151	P₁ ^3-152	r_s
Diary versus interview_a
Total	432	0.14 (1.10)	0.44	0.80	0.66
Beer	432	0.02 (0.55)	0.65	0.93	0.46
Wine	432	0.19 (0.82)	0.50	0.85	0.68
Fortified wine	432	−0.03 (0.25)	0.85	0.99	0.22
Spirits	432	−0.03 (0.24)	0.83	0.99	0.14

Diary versus interview₇
Total	432	0.35 (1.33)	0.38	0.73	0.51
Beer	432	0.12 (0.64)	0.69	0.90	0.31
Wine	432	0.21 (1.02)	0.45	0.77	0.49
Fortified wine	432	0.01 (0.25)	0.89	0.98	0.13
Spirits	432	0.02 (0.22)	0.91	0.98	0.02

Diary versus questionnaire
Total	408	0.41 (1.16)	0.41	0.77	0.60

Interview_aversus interview₇
Total	439	0.22 (0.98)	0.46	0.81	0.63
Beer	439	0.11 (0.47)	0.73	0.94	0.53
Wine	439	0.03 (0.68)	0.51	0.89	0.64
Fortified wine	439	0.04 (0.20)	0.87	0.99	0.33
Spirits	439	0.05 (0.22)	0.87	0.99	0.27

Interview_aversus questionnaire
Total	411	0.27 (0.85)	0.45	0.82	0.67

Interview₇versus questionnaire
Total	411	0.06 (1.12)	0.34	0.79	0.48

↵3-150 The questionnaire did not comprise information on different types of alcohol.
↵3-151 P₀: per cent complete agreement.
↵3-152 P₁: per cent agreement ± 1 category.