Table 1 Number of births by the infants’ characteristics and maternal nationality

Total

4,182,823

9,669

41,041

12,391

6,956

38,037

Maternal age group

 19 years or less

28,648

23

49

88

96

241

 20–24 years

330,369

347

1,798

1,451

938

5,022

 25–29 years

1,079,748

1,668

11,657

3,280

1,853

13,733

 30–34 years

1,538,384

3,732

17,499

3,828

2,100

12,026

 35–39 years

967,597

3,045

8,566

2,939

1,542

5,807

 40 years or more

238,077

854

1,472

805

427

1,208

Sex

 Male

2,145,282

4,934

21,248

6,329

3,552

19,548

 Female

2,037,541

4,735

19,793

6,062

3,404

18,489

Parity

 Primiparous

1,949,391

4,610

21,661

3,749

2,371

19,506

 Multiparous

2,233,432

5,059

19,380

8,642

4,585

18,531

Household occupation

 Farmer

48,699

47

211

164

21

255

 Self-employed

297,958

1,542

5,148

1,404

344

3,500

 Full-time worker 1

1,377,877

3,713

16,372

4,600

1,937

13,884

 Full-time worker 2

2,067,384

3,486

14,855

4,221

3,640

13,722

 Other occupations

357,820

729

3,064

1,308

808

3,957

 Unemployed

33,085

152

1,391

694

206

2,719

Paternal nationality

 Japan

4,139,145

6,456

14,046

7,555

1,306

10,428

 Korea

9,945

2,907

161

25

7

149

 China

5,879

66

26,318

25

7

166

 Philippines

1,408

8

12

4,111

16

44

 Brazil

2,079

4

31

245

5,406

364

 Other countries

24,367

228

473

430

214

26,886

Birth weight

 1499 g or less

23,731

52

230

142

69

320

 1500–2499 g

312,682

507

1,387

885

420

2,206

 2500 g or more

3,846,410

9,110

39,424

11,364

6,467

35,511

Gestational age

 36 weeks or less

192,766

402

1,628

921

535

2,134

 37 weeks or more

3,990,057

9,267

39,413

11,470

6,421

35,903