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Table 1 Number of births and Low birth weight rate in all of Japan by maternal age group and year

From: Analysis of association between low birth weight and socioeconomic deprivation level in Japan: an ecological study using nationwide municipal data

 

Maternal age groups

Year

 < 20 years

20–24 years

25–29 years

30–34 years

35–39 years

40–44 years

 > 44 years

Number of births

  2013

12,964

91,251

282,778

365,381

229,728

46,544

1,116

  2014

13,010

86,589

267,833

359,293

225,873

49,603

1,272

  2015

11,930

84,465

262,259

364,868

228,282

52,554

1,308

  2016

11,099

82,194

250,709

354,984

223,310

53,478

1,401

  2017

9,900

79,272

240,949

345,414

216,947

52,101

1,512

Low birth weight rate*

  2013

102.6

90.0

88.3

92.5

105.4

125.9

214.2

  2014

100.8

89.0

87.5

92.5

105.1

122.9

203.6

  2015

99.9

89.8

86.7

91.3

103.7

123.0

176.6

  2016

100.6

88.0

86.4

92.0

101.6

121.6

187.7

  2017

106.5

89.9

88.0

90.8

101.6

121.5

167.3

  1. *Number of low birth weight infants per 1,000 births