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Table 1 Characteristics of participants: the Tohoku Medical Megabank Project Birth and Three-Generation Cohort Study

From: Associations of education and income with hazardous drinking among postpartum women in Japan: results from the TMM BirThree Cohort Study

 

Total (N=11,031)

Drinking status 1 year after delivery

p valuea

Non-drinkers (n=8626)

Drinkers (n=2405)

n

(%)

n

(%)

n

(%)

Educational attainment

      

<0.001

 University or higher

3268

(29.6)

2602

(30.2)

666

(27.7)

 

 College

4263

(38.7)

3367

(39.0)

896

(37.3)

 

 High school or lower

3500

(31.7)

2657

(30.8)

843

(35.0)

 

Equivalent household income

      

0.0073

 ≥4.00 million JPY

2909

(26.4)

2271

(26.3)

638

(26.5)

 

 3.00–3.99 million JPY

2068

(18.7)

1674

(19.4)

394

(16.4)

 

 2.00–2.99 million JPY

3514

(31.9)

2712

(31.5)

802

(33.4)

 

 ≤1.99 million JPY

2540

(23.0)

1969

(22.8)

571

(23.7)

 

Covariates

       

 Age

      

0.13

  ≤29 years

3226

(29.2)

2512

(29.1)

714

(29.7)

 

  30–34 years

4211

(38.2)

3334

(38.7)

877

(36.5)

 

  ≥35 years

3594

(32.6)

2780

(32.2)

814

(33.9)

 

 Multiparous

5761

(52.2)

4327

(50.2)

1434

(59.6)

<0.001

 Drinking during pregnancy

701

(6.4)

357

(4.1)

344

(14.3)

<0.001

 Working

5815

(52.7)

4382

(50.8)

1433

(59.6)

<0.001

 Postpartum depression

1423

(12.9)

1114

(12.9)

309

(12.9)

0.93

 Breastfeeding

6741

(61.1)

6053

(70.2)

688

(28.6)

<0.001

  1. JPY, Japanese yen
  2. aObtained using the chi-square test, comparing non-drinkers and drinkers