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Seasonal variation in births by instance of re-partnering between subsequent births. Data are for period (a) 1940–1959 (total number of births (N = 1 072 983), (b) 1960–1979 (N = 1 132 224), (c) 1980–1999 (N = 1 051 421) and (d) 2000–2012 (N = 569 358). –––– Same partner and ······ new partner (error bars are 95% CI).
