Decline and loss of birth seasonality in Spain: analysis of 33 421 731 births over 60 years

Cancho‐Candela, Ramón; Llano, Jesús M. Andrés-de; Ardura-Fernández, Julio

doi:10.1136/jech.2006.050211

Cited by 42 publications

(28 citation statements)

References 31 publications

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“…97 years + 24 leap years) daily time series representing all births (24, 947,061) of persons alive at the 1992 or 2002 censuses (similar to Kestenbaum, 1987). Other long data series have been studied before (Cancho-Candela et al, 2007;Ausloos et al, 2015;Rotundo et al, 2015) using different methodologies. In the present case, data points were recorded for 01/01/1905 to 31/12/1991 (31,776 points) from the 1992 census, while the other 3,653 points (corresponding to the period 01/01/1992 to 31/12/2001) are from the 2002 census.…”

Section: Data Sourcesmentioning

confidence: 99%

Effect of religious rules on time of conception in Romania from 1905 to 2001

et al. 2015

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B.V.I., M.A. and G.R. have no competing interests to declare. There is no connection to the current paper, but C.H. declares that (i) he is currently conducting a research titled 'Chronic Diseases' Direct Costs within the Romanian Health System' funded by Local American Working Group; (ii) his wife is employed to a Romanian company (A&D Pharma) that does business in the pharmaceutical sector. This paper is a part of G.R. and M.A. scientific activities in COST Action TD1210. This work by C.H. was co-financed by the European Social Fund through project number POSDRU/1.5/S/59184.

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Section: Data Sourcesmentioning

confidence: 99%

Effect of religious rules on time of conception in Romania from 1905 to 2001

et al. 2015

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“…Studies in the United States found that there is a persistent birth peak in autumn (August-September) and minimum birth in spring (March-May) [6, 7]. In Europe, major early spring peak (April) with a minor autumn peak has been described, similar to the Japanese type [8, 9]. It was reported in Australia that there was a significant shift from a September peak in early 1960s to a February-March peak in the late 1970s and also noted that there was a February-March peak in the northernmost states and a September-October peak in the southernmost States [10].…”

Section: Introductionmentioning

confidence: 99%

“…Evolving changes in the birth rhythm pattern have also been reported. In most cases, there is a common trend towards a decrease in spring births and increase in autumn births, with a decline in amplitude and subsequent loss of seasonality [9]. …”

Section: Introductionmentioning

confidence: 99%

Linear trends and seasonality of births and perinatal outcomes in Upper East Region, Ghana from 2010 to 2014

Osei

Agbemefle

Kye-Duodu

et al. 2016

BMC Pregnancy Childbirth

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BackgroundSeasonal variations greatly influence birth patterns differently from country to country. In Ghana, there is paucity of information on birth seasonal patterns. This retrospective study described the trends and seasonality of births and perinatal outcomes in Upper East Region of Ghana.MethodsBirths occurring in each month of the calendar years (2010–2014; inclusive) were extracted from the District Health Information Management System (DHIMS2) database of the Bolgatanga Municipal Health Directorate and exported into Microsoft Excel spread sheet and Epi Ifo for analysis. Analysis was carried out by calculating average number of births per month correcting for unequal month length using 30 days. A Chi-square test for trend was performed to check for statistical significance (p < 0.05) in trends and seasonality of birth and perinatal outcomes.ResultsThere were 24,171 health facility deliveries, of which 97.7 % were singleton deliveries and 2.3 % were multiple (two or three) deliveries. There was a consistent rise in the annual health facility deliveries controlled for the number of fertile women, from 4169 in 2010 to 5474 in 2014 (p < 0.0001). Monthly birth distribution displayed a periodic pattern with peaks in May, September and October and troughs during the months of January, February and July (p < 0.0001). Women were likely to give birth during the raining season than the dry season. Caesarean Section (CS) rate showed a steady rise over the years (124 per 1000 births in 2010 to 185 per 1000 births in 2014 (p < 0.0001) with overall rate of 14.6 %. Stillbirth (SB) rate, however decreased slightly over the years from 29 per 1000 births to 23 per 1000 births (p = 0.197) with overall SB rate of 2.6 %. Similarly, Low Birth Weight (LBW) declined from 77 per 1000 live births to 71 per 1000 live births from 2010 to 2014 (p < 0.0001). Seasonal (rainy and dry) distributions did not show a clear difference in birth frequencies.ConclusionHealth facility delivery was persistently high in the Bolgatanga Municipality with birth peaking in May, September and October. Despite the rising rate of caesarean section, stillbirth rate did not significantly improved over the years. A prospective study may reveal the reasons for the increasing caesarean section rate. Additionally, understanding the factors that affect the decreasing trends of low birth weight in the municipality is crucial to public health policy makers in Ghana.

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“…The results for w<6 are available upon request Finally, it is important to mention that there are also some studies which do not detect the presence of a significant seasonality in births-see Arcury et al (1990) for the case of a rural US county over the period 1911-1979, Pascual et al (2000 for Tierra del Fuego in Chile, and Cancho-Candela et al (2007) Spain 1991 A time series analysis of the data for Portugal show that in general more births take place in May and September and that fewer births take place in December and February. This is also evident from an overview of the number of births throughout a whole year, from which the September peak in births clearly stands out.…”

Section: Introductionmentioning

confidence: 98%

Exploring the Peaks and Valleys in the Number of Births in Portugal

Caleiro

2009

Hum Ecol

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In spite of the remarkable downward trend in fertility that characterizes Portugal, birth seasonality is still evident. A time series analysis of the data shows that, in general, May and September are months where more births take place and that December and February are the months with the lowest figures. In particular, the September peak in births, which is the most remarkable result, is shown to be related to end-of-year (economic) expectations.

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Decline and loss of birth seasonality in Spain: analysis of 33 421 731 births over 60 years

Cited by 42 publications

References 31 publications

Effect of religious rules on time of conception in Romania from 1905 to 2001

Effect of religious rules on time of conception in Romania from 1905 to 2001

Linear trends and seasonality of births and perinatal outcomes in Upper East Region, Ghana from 2010 to 2014

Exploring the Peaks and Valleys in the Number of Births in Portugal

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