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Table 4 Factors associated with differences between the diary and the CAPI from multiple linear regression, among adults aged 18 and over in the HSE 2011

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

 

Difference in drinking days between diary and CAPI†

Difference in heaviest day between diary and CAPI††

Difference in weekly units between diary and CAPI†††

Coeff.

95% CI

P

 

Coeff.

95% CI

P

 

Coeff.

95% CI

P

 

Sex (female)

-0.03

-0.15 to 0.08

0.564

ns

0.54

-0.02 to 1.09

0.057

ns

1.26

0.03 to 2.49

0.045

*

Age 25-34 (cf 16-24)

-0.07

-0.33 to 0.18

0.567

ns

-0.21

-1.78 to 1.36

0.793

ns

2.49

-1.30 to 6.28

0.197

ns

Age 35-44 (cf 16-24)

-0.26

-0.51 to 0.00

0.049

*

-0.03

-1.64 to 1.59

0.976

ns

2.01

-2.07 to 6.08

0.334

ns

Age 45-54 (cf 16-24)

-0.28

-0.53 to -0.03

0.027

*

-0.76

-2.31 to 0.79

0.338

ns

1.41

-2.81 to 5.63

0.512

ns

Age 55-64 (cf 16-24)

-0.45

-0.72 to -0.19

0.001

**

-0.04

-1.55 to 1.48

0.960

ns

1.46

-2.74 to 5.65

0.496

ns

Age 65-74 (cf 16-24)

-0.60

-0.88 to -0.31

<0.001

***

0.27

-1.27 to 1.82

0.729

ns

2.17

-2.07 to 6.41

0.316

ns

Age 75 (cf 16-24)

-0.71

-1.08 to -0.35

<0.001

***

0.34

-1.29 to 1.97

0.682

ns

2.31

-2.10 to 6.73

0.304

ns

Weekly units (diary)

-0.01

-0.02 to -0.01

<0.001

***

0.16

0.11 to 0.21

<0.001

***

0.23

0.05 to 0.42

0.015

*

Drinking days in diary week

0.34

0.29 to 0.38

<0.001

***

-0.55

-0.84 to -0.25

<0.001

***

-0.43

-1.31 to 0.46

0.344

ns

Drank wine on CAPI heaviest day (cf. beer only)

-0.10

-0.25 to 0.04

0.166

ns

0.37

-0.17 to 0.91

0.180

ns

-0.58

-2.53 to 1.38

0.562

ns

Drank spirits on CAPI heaviest day (cf. beer only)

-0.14

-0.32 to 0.05

0.155

ns

0.18

-0.62 to 0.99

0.652

ns

-0.69

-2.73 to 1.36

0.510

ns

Drank other drinks/combination on CAPI heaviest day (cf. beer only)

-0.30

-0.51 to -0.09

0.006

**

1.23

0.36 to 2.10

0.006

**

0.94

-0.86 to 2.75

0.305

ns

Drank in on trade only in diary week (cf. off trade only)

0.17

0.02 to 0.32

0.024

*

-0.18

-0.84 to 0.49

0.605

ns

1.85

0.53 to 3.17

0.006

**

Drank in on & off trade in diary week (cf. off trade only)

0.11

-0.03 to 0.26

0.122

ns

0.44

-0.10 to 0.98

0.108

ns

1.93

0.34 to 3.52

0.018

*

Drank less than usual in diary week (cf. same as usual)

-0.36

-0.61 to -0.12

0.004

**

-2.18

-3.09 to -1.27

<0.001

***

-10.08

-14.59 to -5.58

<0.001

***

Drank more than usual in diary week (cf. same as usual)

0.59

0.45 to 0.73

<0.001

***

1.62

0.97 to 2.27

<0.001

***

6.09

4.66 to 7.53

<0.001

***

  1. Footnote to table: Coefficients from multiple linear regression accounting for complex survey design and using the drinking diary weight. Coeff. = coefficient, HDD = heaviest drinking day, P = p-value, ns = not significant. * = P < 0.05, ** = P < 0.01, *** = P < 0.001. † = among 2,722 adults with full information on all covariates. †† = among 2,700 adults with full information on all covariates. ††† = among 3,135 adults with full information on all covariates.