Table 2.

The duration of exclusive breastfeeding according to subgroups

Source: KiGGS Baseline Study (2003–2006); KiGGS Wave 1 (2009–2012)

		Cohort 2001/2002	Cohort 2003/2004	Cohort 2005/2006	Cohort 2007/2008
	n	M in months (95% CI)	M in months (95% CI)	M in months (95% CI)	M in months (95% CI)
Age of mother
≤ 24 years	531	3.47 (2.61 – 4.32)	2.81 (2.38 – 3.25)	3.61 (2.94 – 4.27)	3.41 (2.80 – 4.02)
25 – 29 years	1,409	3.53 (3.13 – 3.94)	3.48 (3.13 – 3.83)	3.74 (3.36 – 4.12)	3.54 (3.18 – 3.89)
30 – 34 years	1,855	3.85 (3.59 – 4.10)	4.20 (3.88 – 4.51)	3.97 (3.63 – 4.31)	4.11 (3.89 – 4.34)
≥35 years	1,300	4.27 (3.95 – 4.59)	3.95 (3.66 – 4.23)	4.24 (3.94 – 4.55)	4.32 (4.00 – 4.63)
Educational status of the mother
Low	476	3.40 (2.72 – 4.08)	3.27 (2.70 – 3.83)	3.61 (3.16 – 4.06)	3.32 (2.69 – 3.95)
Medium	3,362	3.73 (3.51 – 3.94)	3.76 (3.58 – 3.95)	3.94 (3.68 – 4.19)	3.97 (3.77 – 4.17)
Higher	1,254	4.44 (4.13 – 4.75)	4.11 (3.76 – 4.45)	4.33 (4.08 – 4.58)	4.31 (4.08 – 4.53)
Number of siblings
0	2,169	3.90 (3.55 – 4.25)	3.63 (3.34 – 3.93)	3.99 (3.72 – 4.25)	3.87 (3.62 – 4.12)
1	1,850	3.43 (3.15 – 3.72)	3.86 (3.61 – 4.12)	3.94 (3.60 – 4.28)	3.83 (3.54 – 4.11)
2 or more	861	4.28 (3.93 – 4.64)	3.70 (3.11 – 4.29)	3.98 (3.61 – 4.35)	4.32 (3.88 – 4.75)
Twins/Multiple births	182	4.03 (2.80 – 5.26)	3.83 (3.02 – 4.64)	3.10 (1.90 – 4.30)	3.78 (2.69 – 4.87)
Smoking in pregnancy
Yes	470	3.57 (2.88 – 4.27)	2.96 (2.19 – 3.73)	3.39 (2.52 – 4.26)	2.67 (2.06 – 3.27)
No	4,604	3.83 (3.58 – 4.04)	3.78 (3.58 – 3.97)	3.99 (3.78 – 4.19)	4.02 (3.85 – 4.19)
(Pre)maturity
Premature birth	408	4.01 (3.46 – 4.57)	3.60 (3.01 – 4.18)	3.17 (2.44 – 3.90)	3.11 (2.44 – 3.78)
Mature or definitely post-term-birth	4,658	3.78 (3.57 – 3.99)	3.75 (3.56 – 3.95)	3.99 (3.79 – 4.19)	4.01 (3.83 – 4.19)
Region
West	3,395	3.91 (3.69 – 4.14)	3.82 (3.62 – 4.02)	3.98 (3.78 – 4.23)	3.98 (3.78 – 4.19)
East (incl. Berlin)	1,700	3.35 (3.00 – 3.70)	3.41 (2.97 – 3.84)	3.68 (3.44 – 3.92)	3.79 (3.48 – 4.09)

M = mean, CI = confidence interval