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Table 2 Mean frequency or quantity of alcohol consumption in the diary and the CAPI

From: Drinking pattern is more strongly associated with under-reporting of alcohol consumption than socio-demographic factors: evidence from a mixed-methods study

 

Number of drinking days*

 

Diary

CAPI

  
 

Mean

Mean

P for difference

Weighted n

Total

3.4

3.2

<0.001

3,356

Men

3.6

3.3

<0.001

1,901

Women

3.1

3.0

<0.001

1,454

 

Units on heaviest drinking day*

 

Diary

CAPI

  
 

Mean

Mean

P for difference

Weighted n

Total

7.7

6.8

<0.001

3,333

Men

8.9

8.2

<0.001

1,891

Women

6.2

5.1

<0.001

1,442

 

Weekly alcohol consumption**

 

Diary

CAPI

  
 

Mean

Mean

P for difference

Weighted n

Total

16.8

16.1

0.017

3,796

Men

20.3

19.8

0.282

2,092

Women

12.5

11.6

0.003

1,704

  1. *Base = participants aged 18 and over who drank alcohol on at least one day in both the diary and CAPI weeks.
  2. **Base = participants aged 18 and over who drank alcohol on at least one day in the diary week and reported average weekly consumption in the last 12 months. Smaller n for heaviest drinking day reflects that not all drinkers drank in CAPI week.