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Seasonal Pattern

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Journal Article
Demography (1979) 16 (1): 103–119.
Published: 01 February 1979
...Jane Menken Abstract Seasonal patterns in conception rates have been documented in several recent studies. In this paper, a mathematical model of the reproductive process is developed through which the impact of such variation in conception rates is assessed. It is found that the effect...
Journal Article
Demography (1990) 27 (3): 397–411.
Published: 01 August 1990
... was less pronounced when urban development and colonial agricultural intensification produced more heterogeneous seasonal patterns of labor. We find that changes in agricultural organization, rather than purely a shift to nonagricultural production, may significantly reduce established seasonal timing...
Journal Article
Demography (1966) 3 (2): 305–318.
Published: 01 June 1966
...Harry M. Rosenberg Summary Birth rates, marriage rates, and death rates computed on a monthly basis have exhibited relatively stable seasonal patterns over a period of years. Elimination of these seasonal fluctuations facilitates the description and interpretation of month-to-month changes...
Journal Article
Demography (2007) 44 (4): 705–728.
Published: 01 November 2007
...). When unobserved characteristics of the couples are considered, this seasonal pattern of conception persists. 13 1 2011 © Population Association of America 2007 2007 Menstrual Cycle Sexual Intercourse Risk Model Unobserved Heterogeneity Previous Pregnancy References...
Journal Article
Demography (1986) 23 (1): 13–30.
Published: 01 February 1986
...Victor Levy Abstract The annual birth cycle in rural Egypt peaks in December and has two distinguishable minima in June and September. This pattern bears a striking inverse resemblance to the seasonal movements of employment and wages. Infant and child mortality and marriage also display stable...
Journal Article
Demography (1996) 33 (3): 291–305.
Published: 01 August 1996
... that temperature has quantitatively important effects on both seasonal and nonseasonal variation in births. Summer temperature extremes reduce conceptions in the southern United States, explaining a substantial part of the observed seasonal birth pattern. Extreme cold shows no evidence of affecting conceptions...
Journal Article
Demography (1985) 22 (1): 89–100.
Published: 01 February 1985
...Daniel A. Seiver Abstract This paper documents the postwar pattern of seasonality of births, for the United States and its divisions, using a simple time-varying parameter model. Variations over time and over space in seasonality are analyzed. In general, the South exhibits the greatest seasonal...
Journal Article
Demography (1967) 4 (2): 673–679.
Published: 01 June 1967
...; and for the highest socioeconomic quintile census tracts, Baltimore, 1952–56. However, shifting the birth rates back forty weeks to approximate conception dates revealed no association with the observed coital rates. If the pattern presented has great generality, seasonal variations in births cannot be explained...
Journal Article
Demography (1994) 31 (2): 321–346.
Published: 01 May 1994
... of the model by analyzing proposed explanations of birth seasonality that rely on extreme summer heat. 12 1 2011 © Population Association of America 1994 1994 Seasonal Pattern Seasonal Fluctuation Fetal Loss Extreme Heat Susceptible Population References Bongaarts J...
Image
Published: 03 January 2019
shows the average for 23- to 25-year-old mothers. Graphs in the first row show both age groups on the same scale; graphs in the second row use different scales to allow for a better comparison of the seasonal patterns (left axis for 17- to 19-year-olds and right axis for 23- to 25-year-olds More
Journal Article
Demography (1983) 20 (4): 541–568.
Published: 01 November 1983
... References Anderson R. L. ( 1942 ). Distribution of the Serial Correlation Coefficient . Annals of Mathematical Statistics , 13 , 1 – 13 . 10.1214/aoms/1177731638 Becker Stan ( 1981 ). Seasonal Patterns of Fertility Measures: Theory and Data . Journal of the American Statistical...
Journal Article
Demography (2022) 59 (1): 13–26.
Published: 01 February 2022
... to estimate differences in gender disparities following the onset of the epidemic in March. To account for seasonal or cyclical patterns in women's employment relative to men's, we compare gender differences in employment with those observed in the preceding year. Our fixed-effects models account for the time...
FIGURES
Includes: Supplementary data
Journal Article
Demography (1984) 21 (4): 501–517.
Published: 01 November 1984
..., showing that the seasonal absence of migrant husbands disrupted both the level and timing of fertility. However, the effect was greater for legal than for illegal migrants, a pattern that stemmed from social factors as well as physical separation. A logistic regression analysis showed that reductions...
Journal Article
Demography (1993) 30 (2): 127–142.
Published: 01 May 1993
... the conception window. The employment of such coital strategies would be consistent with the upwardly-ramped seasonal pattern of birth increases that characterizes this phenomenon (Goodkind 1992b). We should note also the typical seasonal patterns of conceptions that are to be expected. In Taiwan, as in most...
Journal Article
Demography (1989) 26 (3): 425–437.
Published: 01 August 1989
... percent. A seasonal pattern of changes in maternal weight (and arm circumference) was observed. As indicated in Figure 1, maternal weight worsened in the fall (September-October) and was generally better in the winter months (January-February). This figure also shows the strong relationship of educational...
Journal Article
Demography (1996) 33 (1): 98–110.
Published: 01 February 1996
... ). New York : United Nations . van den Broeck L. , Eeckels R. , & Devlieger H. ( 1993 ). Child Morbidity Patterns in Two Tropical Seasons and Associated Mortality Rates . International Journal of Epidemiology , 22 , 1104 – 10 . 10.1093/ije/22.6.1104 Walsh R.P.D...
Journal Article
Demography (2004) 41 (3): 547–568.
Published: 01 August 2004
.... ( 1995 ). What’s Age Got to Do With It? A Study of Patterns of School Entry and the Impact of Season of Birth on School Attainment . Educational Research , 37 , 251 – 65 . Skirbekk V. , Kohler H.-P. , & Prskawetz A. ( 2003 ). Completing Education and the Timing of Births...
Journal Article
Demography (1982) 19 (1): 79–95.
Published: 01 February 1982
... separa- tions and on the expected length of postpartum anovulation, only very sec- ondarily on the levels of natural fecunda- bility and abortion risk. To show that this pattern of relationships holds also for seasonal separation is the focus of this section. The range of annual months of separa- tion...
Journal Article
Demography (2018) 55 (4): 1269–1293.
Published: 02 July 2018
... work has found that spermatogenesis and the menstrual cycle, including the ovulation rate, differ by season but that factors other than temperature may be affecting these seasonal patterns (Ellison et al. 2005 ; Levine 1991 ; Rojansky et al. 1992 ; Svartberg et al. 2003 ). However, compelling...
FIGURES | View All (7)
Includes: Supplementary data
Journal Article
Demography (1968) 5 (1): 306–310.
Published: 01 March 1968
.... A much lower correlation coefficient was found between the two (r = 0.160) when based on rates of change between successive quarters. Seasonality patterns differed material- ly. Seasonal indexes, based on the 54- month period of record, were as shown in the accompanying tabulation. Quarter Visitors...