Chapter 9 Global Summary

9.0.1 Total adolescent births

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Total adolescent births per woman

	Region	5-year birth cohort	Unweighted average	Weighted average
		1940 1995	0.461918762913962 0.793456375642851	0.385032059804716 0.814245622506265
1	World	1940	0.79	0.81
2	World	1945	0.79	0.77
3	World	1950	0.73	0.74
4	World	1955	0.72	0.72
5	World	1960	0.67	0.69
6	World	1965	0.62	0.63
7	World	1970	0.58	0.60
8	World	1975	0.57	0.58
9	World	1980	0.55	0.54
10	World	1985	0.51	0.50

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9.0.2 Total adolescent births by age at first birth

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Total adolescent births per woman by age of first birth

	Region	5-year birth cohort	Age at first birth	Unweighted average	Weighted average
		1940 1995		1.053822128570410 2.932715414681350	1.051146613525070 2.937981801984050
1	World	1940	14 years and younger	2.89	2.81
2	World	1940	15-17 years	1.91	1.89
3	World	1940	18-19 years	1.12	1.11
4	World	1945	14 years and younger	2.93	2.94
5	World	1945	15-17 years	1.91	1.86
6	World	1945	18-19 years	1.12	1.11
7	World	1950	14 years and younger	2.93	2.87
8	World	1950	15-17 years	1.89	1.88
9	World	1950	18-19 years	1.11	1.10
10	World	1955	14 years and younger	2.78	2.80

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9.0.3 Contribution to total adolescent fertility by cohort and age at first birth

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Contribution to total adolescent fertility by age at first birth

	Region	5-year birth cohort	Age at first birth	Unweighted average	Weighted average
		1940 1995		0.108388414485558 0.501065289692941	0.075202551325065 0.502906377185435
1	World	1940	14 years and younger	0.18	0.20
2	World	1940	15-17 years	0.50	0.48
3	World	1940	18-19 years	0.32	0.32
4	World	1945	14 years and younger	0.20	0.20
5	World	1945	15-17 years	0.49	0.49
6	World	1945	18-19 years	0.32	0.33
7	World	1950	14 years and younger	0.17	0.18
8	World	1950	15-17 years	0.49	0.49
9	World	1950	18-19 years	0.36	0.35
10	World	1955	14 years and younger	0.17	0.17

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9.0.4 Completed fertility by motherhood entry age

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completed fertility by motherhood entry age

	Region	5-year birth cohort	Age at first birth	Unweighted average	Weighted average
		1940 1975		3.842383160927060 7.286502425298580	3.382688152406220 6.357514890031180
1	World	1940	All mothers	6.36	5.57
2	World	1940	In adolescence	7.29	6.36
3	World	1940	After adolescence	5.58	4.79
4	World	1945	All mothers	5.99	5.19
5	World	1945	In adolescence	6.92	6.00
6	World	1945	After adolescence	5.17	4.43
7	World	1950	All mothers	5.77	4.98
8	World	1950	In adolescence	6.64	5.75
9	World	1950	After adolescence	4.96	4.19
10	World	1955	All mothers	5.42	4.52

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9.0.5 Difference in completed fertility between adolescent and non-adolescent mothers

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Difference in completed fertility between adolescent and non-adolescent mothers

	Region	5-year birth cohort	Unweighted average	Weighted average
		1940 1975	1.380925819668890 1.746199288439050	1.167164003494580 1.565635713682760
1	World	1940	1.71	1.56
2	World	1945	1.75	1.57
3	World	1950	1.69	1.56
4	World	1955	1.52	1.38
5	World	1960	1.59	1.39
6	World	1965	1.47	1.22
7	World	1970	1.48	1.17
8	World	1975	1.38	1.20

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9.0.6 Contribution of adolescent fertility to total fertility by cohort

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Contribution of adolescent fertility to total fertility by cohort

	Region	5-year birth cohort	Unweighted proportion	Weighted proportion
		1940 1975	0.122161249151281 0.135398664718118	0.148814216014549 0.164959411733230
1	World	1940	0.12	0.15
2	World	1945	0.13	0.15
3	World	1950	0.14	0.16
4	World	1955	0.13	0.16
5	World	1960	0.13	0.16
6	World	1965	0.13	0.16
7	World	1970	0.13	0.16
8	World	1975	0.13	0.16

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9.0.7 Mean age at first birth

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Mean age at first birth, women with first birth before age 30

	Region	5-year birth cohort	Unweighted average	Weighted average
		1940 1985	20.80785690342320 21.58440005684210	20.69869544557230 21.44575883232870
1	World	1940	20.9	20.7
2	World	1945	20.8	20.8
3	World	1950	21.0	20.8
4	World	1955	21.0	20.9
5	World	1960	21.3	21.1
6	World	1965	21.5	21.4
7	World	1970	21.6	21.4
8	World	1975	21.5	21.4
9	World	1980	21.5	21.4
10	World	1985	21.4	21.3

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9.0.8 Adolescent parity progression ratios

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Adolescent parity progression ratios

	Region	5-year birth cohort	Progression ratio from	Unweighted average	Weighted average
		1940 1995		0.079513561493460 0.458293629972098	0.049183526675868 0.470974865964191
1	World	1940	none to 1st birth	0.46	0.47
2	World	1940	1st to 2nd birth	0.45	0.46
3	World	1940	2nd to 3rd birth	0.32	0.33
4	World	1940	3rd to 4th birth	0.24	0.24
5	World	1940	4th to 5th birth	0.22	0.24
6	World	1945	none to 1st birth	0.45	0.45
7	World	1945	1st to 2nd birth	0.46	0.44
8	World	1945	2nd to 3rd birth	0.32	0.30
9	World	1945	3rd to 4th birth	0.26	0.25
10	World	1945	4th to 5th birth	0.25	0.22

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9.0.9 Adolescent parity progression ratios by age at first birth (all cohorts)

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Adolescent partiy progression ratios by mother's age at first birth (all cohorts)

	Region	Age at first birth	Progression ratio from	Unweighted average	Weighted average
				0.002638722757883 0.770760467349776	0.018367375981521 0.801413426724803
1	World	14 years and younger	none to 1st birth	0.04	0.04
2	World	15-17 years	none to 1st birth	0.17	0.17
3	World	18-19 years	none to 1st birth	0.18	0.18
4	World	14 years and younger	1st to 2nd birth	0.77	0.80
5	World	15-17 years	1st to 2nd birth	0.59	0.59
6	World	18-19 years	1st to 2nd birth	0.08	0.08
7	World	14 years and younger	2nd to 3rd birth	0.54	0.53
8	World	15-17 years	2nd to 3rd birth	0.19	0.19
9	World	18-19 years	2nd to 3rd birth	0.02	0.02
10	World	14 years and younger	3rd to 4th birth	0.29	0.29

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9.0.10 Adolescent parity progression ratios by age at first birth and cohort

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Adolescent partiy progression ratios by mother's age at first birth

	Region	5-year birth cohort	Age at first birth	Progression ratio from	Weighted average
		1940 1995			0.005490063797661 0.845373220236164
1	World	1940	14 years and younger	none to 1st birth	0.06
2	World	1940	15-17 years	none to 1st birth	0.22
3	World	1940	18-19 years	none to 1st birth	0.19
4	World	1940	14 years and younger	1st to 2nd birth	0.85
5	World	1940	15-17 years	1st to 2nd birth	0.67
6	World	1940	18-19 years	1st to 2nd birth	0.11
7	World	1940	14 years and younger	2nd to 3rd birth	0.64
8	World	1940	15-17 years	2nd to 3rd birth	0.26
9	World	1940	18-19 years	2nd to 3rd birth	0.04
10	World	1945	14 years and younger	none to 1st birth	0.06

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9.0.11 Rapid Repeat Birth probability

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Likelihood that an adolescent mother has a rapid repeat birth before turning 20

	Region	5-year birth cohort	Unweighted average	Weighted average
		1940 1995	0.210264410330614 0.386450335024761	0.220577275016895 0.366716612112827
1	World	1940	0.38	0.36
2	World	1945	0.39	0.37
3	World	1950	0.37	0.35
4	World	1955	0.35	0.33
5	World	1960	0.34	0.33
6	World	1965	0.31	0.31
7	World	1970	0.29	0.29
8	World	1975	0.28	0.27
9	World	1980	0.26	0.26
10	World	1985	0.24	0.24

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9.0.12 Rapid Repeat Birth proportion

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Proportion of all nonfirst adolescent births that are rapid repeat births

	Region	5-year birth cohort	Unweighted average	Weighted average
		1940 1995	0.511700547345319 0.622178854795614	0.524612598264198 0.608553282156779
1	World	1940	0.61	0.60
2	World	1945	0.62	0.61
3	World	1950	0.61	0.57
4	World	1955	0.60	0.56
5	World	1960	0.60	0.60
6	World	1965	0.59	0.58
7	World	1970	0.58	0.57
8	World	1975	0.56	0.54
9	World	1980	0.55	0.54
10	World	1985	0.53	0.52

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