2.43 Summary Sub-Saharan Africa | New Adolescent Fertility Measures for the Long-term Perspective

2.43.1 Total adolescent births

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Total adolescent births per woman
	Region	5-year birth cohort	Unweighted average	Weighted average
		1940 1995	0.663464544396898 0.986584268913919	0.675446299300227 1.019086134938480
1	Sub-Saharan Africa	1940	0.90	0.93
2	Sub-Saharan Africa	1945	0.99	1.02
3	Sub-Saharan Africa	1950	0.94	0.98
4	Sub-Saharan Africa	1955	0.95	1.01
5	Sub-Saharan Africa	1960	0.87	0.90
6	Sub-Saharan Africa	1965	0.83	0.87
7	Sub-Saharan Africa	1970	0.77	0.79
8	Sub-Saharan Africa	1975	0.76	0.78
9	Sub-Saharan Africa	1980	0.75	0.77
10	Sub-Saharan Africa	1985	0.74	0.76

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2.43.2 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		1.048153058679790 2.928939059655820	1.053139353604930 2.955430159329980
1	Sub-Saharan Africa	1940	14 years and younger	2.86	2.94
2	Sub-Saharan Africa	1940	15-17 years	1.87	1.90
3	Sub-Saharan Africa	1940	18-19 years	1.09	1.10
4	Sub-Saharan Africa	1945	14 years and younger	2.93	2.96
5	Sub-Saharan Africa	1945	15-17 years	1.91	1.93
6	Sub-Saharan Africa	1945	18-19 years	1.09	1.10
7	Sub-Saharan Africa	1950	14 years and younger	2.92	2.87
8	Sub-Saharan Africa	1950	15-17 years	1.88	1.88
9	Sub-Saharan Africa	1950	18-19 years	1.09	1.09
10	Sub-Saharan Africa	1955	14 years and younger	2.79	2.84

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2.43.3 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		0.140835388095750 0.523008048356688	0.155792588208285 0.524394549768615
1	Sub-Saharan Africa	1940	14 years and younger	0.20	0.25
2	Sub-Saharan Africa	1940	15-17 years	0.52	0.51
3	Sub-Saharan Africa	1940	18-19 years	0.27	0.24
4	Sub-Saharan Africa	1945	14 years and younger	0.24	0.26
5	Sub-Saharan Africa	1945	15-17 years	0.52	0.51
6	Sub-Saharan Africa	1945	18-19 years	0.24	0.23
7	Sub-Saharan Africa	1950	14 years and younger	0.21	0.25
8	Sub-Saharan Africa	1950	15-17 years	0.52	0.50
9	Sub-Saharan Africa	1950	18-19 years	0.27	0.25
10	Sub-Saharan Africa	1955	14 years and younger	0.22	0.25

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2.43.4 Contribution to total adolescent fertility by age at first birth (all cohorts)

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Contribution to total adolescent fertility by age at first birth (all cohorts)
	Region	Age at first birth	Unweighted average	Weighted average
			0.190863043155390 0.502976780058173	0.209194922612069 0.510203100834672
1	Sub-Saharan Africa	14 years and younger	0.19	0.21
2	Sub-Saharan Africa	15-17 years	0.50	0.51
3	Sub-Saharan Africa	18-19 years	0.31	0.28

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2.43.5 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		4.539382273266330 7.943506219095501	4.559118632344340 7.758339879119530
1	Sub-Saharan Africa	1940	All mothers	7.24	6.99
2	Sub-Saharan Africa	1940	In adolescence	7.94	7.76
3	Sub-Saharan Africa	1940	After adolescence	6.45	6.20
4	Sub-Saharan Africa	1945	All mothers	7.02	6.91
5	Sub-Saharan Africa	1945	In adolescence	7.69	7.59
6	Sub-Saharan Africa	1945	After adolescence	6.12	6.00
7	Sub-Saharan Africa	1950	All mothers	6.90	6.96
8	Sub-Saharan Africa	1950	In adolescence	7.58	7.72
9	Sub-Saharan Africa	1950	After adolescence	5.96	5.81
10	Sub-Saharan Africa	1955	All mothers	6.53	6.62

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2.43.6 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	1.491552513945610 1.711135696737070	1.554943346969900 1.907070709875880
1	Sub-Saharan Africa	1940	1.49	1.55
2	Sub-Saharan Africa	1945	1.58	1.59
3	Sub-Saharan Africa	1950	1.62	1.91
4	Sub-Saharan Africa	1955	1.61	1.63
5	Sub-Saharan Africa	1960	1.71	1.79
6	Sub-Saharan Africa	1965	1.58	1.68
7	Sub-Saharan Africa	1970	1.61	1.73
8	Sub-Saharan Africa	1975	1.57	1.78

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2.43.7 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	0.126251284258744 0.148185103735814	0.130957306715751 0.159813802429205
1	Sub-Saharan Africa	1940	0.13	0.13
2	Sub-Saharan Africa	1945	0.15	0.15
3	Sub-Saharan Africa	1950	0.15	0.16
4	Sub-Saharan Africa	1955	0.15	0.16
5	Sub-Saharan Africa	1960	0.14	0.14
6	Sub-Saharan Africa	1965	0.14	0.14
7	Sub-Saharan Africa	1970	0.14	0.14
8	Sub-Saharan Africa	1975	0.14	0.14

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2.43.8 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	19.92600309219800 20.73404173859220	19.79870082305570 20.61134149518960
1	Sub-Saharan Africa	1940	20.3	20.4
2	Sub-Saharan Africa	1945	20.0	19.9
3	Sub-Saharan Africa	1950	20.0	20.0
4	Sub-Saharan Africa	1955	19.9	19.8
5	Sub-Saharan Africa	1960	20.4	20.3
6	Sub-Saharan Africa	1965	20.5	20.3
7	Sub-Saharan Africa	1970	20.7	20.6
8	Sub-Saharan Africa	1975	20.6	20.5
9	Sub-Saharan Africa	1980	20.6	20.5
10	Sub-Saharan Africa	1985	20.4	20.3

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2.43.9 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		0.084775741624036 0.556942806784038	0.078137839097592 0.571739326408918
1	Sub-Saharan Africa	1940	4th to 5th birth	0.22	0.23
2	Sub-Saharan Africa	1940	3rd to 4th birth	0.22	0.27
3	Sub-Saharan Africa	1940	2nd to 3rd birth	0.34	0.39
4	Sub-Saharan Africa	1940	1st to 2nd birth	0.46	0.49
5	Sub-Saharan Africa	1940	none to 1st birth	0.53	0.53
6	Sub-Saharan Africa	1945	4th to 5th birth	0.27	0.27
7	Sub-Saharan Africa	1945	3rd to 4th birth	0.30	0.33
8	Sub-Saharan Africa	1945	2nd to 3rd birth	0.37	0.38
9	Sub-Saharan Africa	1945	1st to 2nd birth	0.50	0.52
10	Sub-Saharan Africa	1945	none to 1st birth	0.55	0.56

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2.43.10 Adolescent parity progression ratios by age (all cohorts)

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Adolescent parity progression ratios by mother's age at first birth
	Region	Age at first birth	Progression ratio from	Unweighted average	Weighted average
				0.000000000000000 0.850731139339440	0.000000000000000 0.858237688625198
1	Sub-Saharan Africa	14 years and younger	none to 1st birth	0.06	0.07
2	Sub-Saharan Africa	15-17 years	none to 1st birth	0.24	0.24
3	Sub-Saharan Africa	18-19 years	none to 1st birth	0.21	0.20
4	Sub-Saharan Africa	14 years and younger	1st to 2nd birth	0.85	0.86
5	Sub-Saharan Africa	15-17 years	1st to 2nd birth	0.60	0.62
6	Sub-Saharan Africa	18-19 years	1st to 2nd birth	0.07	0.07
7	Sub-Saharan Africa	14 years and younger	2nd to 3rd birth	0.60	0.63
8	Sub-Saharan Africa	15-17 years	2nd to 3rd birth	0.18	0.20
9	Sub-Saharan Africa	18-19 years	2nd to 3rd birth	0.03	0.03
10	Sub-Saharan Africa	14 years and younger	3rd to 4th birth	0.32	0.33

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Adolescent parity progression ratios by mother's age at first birth by cohort
	Region	Age at first birth	5-yr birth cohort	Progression ratio from	Unweighted average	Weighted average
			1940 1995		0.000000000000000 0.914147698465061	0.000000000000000 0.897531824152513
1	Sub-Saharan Africa	14 years and younger	1940	none to 1st birth	0.07	0.08
2	Sub-Saharan Africa	15-17 years	1940	none to 1st birth	0.25	0.25
3	Sub-Saharan Africa	18-19 years	1940	none to 1st birth	0.21	0.20
4	Sub-Saharan Africa	14 years and younger	1940	1st to 2nd birth	0.91	0.90
5	Sub-Saharan Africa	15-17 years	1940	1st to 2nd birth	0.67	0.68
6	Sub-Saharan Africa	18-19 years	1940	1st to 2nd birth	0.09	0.10
7	Sub-Saharan Africa	14 years and younger	1940	2nd to 3rd birth	0.67	0.73
8	Sub-Saharan Africa	15-17 years	1940	2nd to 3rd birth	0.26	0.28
9	Sub-Saharan Africa	18-19 years	1940	2nd to 3rd birth	0.02	0.03
10	Sub-Saharan Africa	14 years and younger	1940	3rd to 4th birth	0.38	0.40

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2.43.11 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	0.173955482438861 0.341891213668954	0.210694402933067 0.353839028057906
1	Sub-Saharan Africa	1940	0.32	0.33
2	Sub-Saharan Africa	1945	0.34	0.35
3	Sub-Saharan Africa	1950	0.32	0.32
4	Sub-Saharan Africa	1955	0.30	0.31
5	Sub-Saharan Africa	1960	0.30	0.30
6	Sub-Saharan Africa	1965	0.27	0.28
7	Sub-Saharan Africa	1970	0.25	0.26
8	Sub-Saharan Africa	1975	0.24	0.25
9	Sub-Saharan Africa	1980	0.23	0.25
10	Sub-Saharan Africa	1985	0.22	0.24

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2.43.12 Rapid Repeat Birth proportion

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Proportion of all nonfirst adolescent births that are rapid repeat births before
	Region	5-year birth cohort	Unweighted average	Weighted average
		1940 1995	0.401645998305783 0.538848553033375	0.432519321080096 0.548321862136608
1	Sub-Saharan Africa	1940	0.51	0.51
2	Sub-Saharan Africa	1945	0.54	0.55
3	Sub-Saharan Africa	1950	0.52	0.51
4	Sub-Saharan Africa	1955	0.49	0.49
5	Sub-Saharan Africa	1960	0.49	0.49
6	Sub-Saharan Africa	1965	0.47	0.47
7	Sub-Saharan Africa	1970	0.46	0.47
8	Sub-Saharan Africa	1975	0.46	0.47
9	Sub-Saharan Africa	1980	0.45	0.46
10	Sub-Saharan Africa	1985	0.44	0.45

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