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Spring Peak

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Journal Article
Demography (1996) 33 (3): 291–305.
Published: 01 August 1996
.... The results also show significant seasonality in births even after accounting for temperature. Controls for monthly temperature do not explain the persistent spring peak in births in northern Europe. This finding suggests that other factors play an important role. 14 1 2011 © Population...
Journal Article
Demography (1983) 20 (1): 45–59.
Published: 01 February 1983
... with regression techniques. The results show that temporal variations are stronger in MVF than in suicides but are present in both. MVF tend to peak on Saturday, in the summer months, in 1972 and 1973, and on holidays. Suicides are generally highest on Monday, in the spring months, in 1975 and 1976...
Journal Article
Demography (1994) 31 (2): 321–346.
Published: 01 May 1994
... for lower-income, nonwhite groups. We emphasize that the seasonal pattern displayed in Figure 1, and the apparent role of extreme heat, are not present in all populations. As documented in Lam and Miron (199la), for example, European populations exhibit dramatic spring peaks in births even though Europe...
Journal Article
Demography (1985) 22 (1): 89–100.
Published: 01 February 1985
... and statistically insignificant, and the AUG~ is half the size of MAY~. For the United States as a whole, then, the pattern of seasonality has changed significantly in the postwar period, with the spring trough shrinking, and the fall peak de- clining only slightly. The statistically sig- nificant fall in February...
Journal Article
Demography (1974) 11 (2): 227–245.
Published: 01 May 1974
... occupations do average earnings peak at the same time family income needs are peaking. For most blue-collar and many medium- and low-level white collar occupations, median earnings are highest for younger men, and men at an age when family costs are at their maximum are earning somewhat less, on the average...
Journal Article
Demography (2022) 59 (5): 1953–1979.
Published: 01 October 2022
... across racial groups and cities, it is highly imperfect, made necessary by the almost total lack of historical data on race-specific influenza exposure rates. To our knowledge, such data were collected only during the peak of the 1918 pandemic (rather than the spring) from nonrandom samples in six U.S...
FIGURES | View All (5)
Includes: Supplementary data
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 (1990) 27 (3): 397–411.
Published: 01 August 1990
... 1983; Wolf & Huang 1980). Figure 2 presents the simple mean monthly value of births, deaths, and marriages for Taiwan for 1906-1943. Major yearly cycles exist in all three events, with births peaking in the winter months, deaths peaking in late summer, and marriages peaking at the beginning...
Journal Article
Demography (1993) 30 (2): 127–142.
Published: 01 May 1993
... later exhibits a corresponding trough in spring births and a peak in autumn births. The typical wavelike seasonal pattern of conceptions is illustrated by the line in Figure 3, which represents the average pattern between 1970 and 1979 for the never-users of contraception just described. The base of 1...
Journal Article
Demography (1974) 11 (4): 563–585.
Published: 01 November 1974
.... W. ( 1971 ). The Statistical Analysis of Time Series . New York : John Wiley & Sons . Birdsell Joseph ( 1957 ). Some Population Problems Involving Pleistocene Man . Cold Springs Harbor Symposia on Quantitative Biology , 22 , 47 – 69 . Bernardelli Harre ( 1941...
Journal Article
Demography (1984) 21 (3): 271–295.
Published: 01 August 1984
...: General Characteristics of the Epidemics An examination of the total number of deaths in Aland for the 140-year time period from 1751 to 1890reveals that the archipelago experienced a number of peak periods of mortality (Figure 3). Further examination of the death records indicates that most of the high...
Journal Article
Demography (2021) 58 (2): 419–450.
Published: 01 April 2021
... (January–March) low point. 8 There are also few differences in birth timing by socioeconomic status, and those differences do not suggest systematic variation in spring births. In 2007, the only observed differences by maternal occupational class were that births to agricultural workers peaked in winter...
FIGURES
Includes: Supplementary data
Journal Article
Demography (2007) 44 (4): 705–728.
Published: 01 November 2007
... in a Norwegian study that the lowest testosterone levels occur in months with the highest temperatures and longest hours of daylight, whereas Anders- son et al. (2003), examining Danish data, observed the peak level during June July, with minimum levels occurring in winter early spring. Four conclusions can...
Journal Article
Demography (1999) 36 (2): 247–261.
Published: 01 May 1999
..., and riots reached a peak in the spring of 1974 and culminated several months later in the overthrow of the monarchy by a group of junior military officers (Tiruneh 1993:47). The provisional military government, or Dergue (the committee) as it became known, rapidly con- solidated power under the leadership...
Journal Article
Demography (1993) 30 (3): 405–423.
Published: 01 August 1993
... series was tested as follows. Under the null hypothesis, Ho ' no cyclic component is present in the time series (which is assumed to be distributed normally about its mean). It can be shown that the peaks of the power spectrum of the time series divided by the variance are distributed proportionally...
Journal Article
Demography (1997) 34 (1): 17–30.
Published: 01 February 1997
... , 4 , 189 – 93 . America’s Centenarians . 1987. U.S. Department of Commerce Series P-23, No. 153. Anderson W.F. ( 1995 ). Gene Therapy . Scientific American , 273 , 124 – 28 . Ashburner M. ( 1989 ). Drosophila: A Laboratory Handbook . Cold Spring Harbor, NY : Cold...
Journal Article
Demography (1968) 5 (1): 508–524.
Published: 01 March 1968
... migration. A basic regular- ity of pattern is observed, in that the rates form roughly a bell-shaped curve peaking in the age group 25-29 years and with an elongated tail on the right of the peak. A particularly useful contribution is her analysis of the impact of return migration as a factor that helps...
Journal Article
Demography (2022) 59 (6): 2025–2051.
Published: 01 December 2022
... ). If so, and given that repeated infection during pregnancy is extremely rare, early-pregnancy infection would be a confounder in our analysis: it both reduces the odds of infection at the time of birth and increases the odds of preterm birth. The substantial increase in preterm births during the peak...
FIGURES | View All (6)
Includes: Supplementary data
Journal Article
Demography (2019) 56 (5): 1723–1746.
Published: 09 September 2019
... al. 2015 ). Similarly, a peak in excess mortality during the 2009 H1N1 pandemic was observed at age 52—that is, for those born in 1957—at the time of the H2N2 Asian flu pandemic (Gagnon et al. 2018a ). Hence, whereas mortality at all ages during a given year should reflect the virulence...
FIGURES | View All (6)
Includes: Supplementary data
Journal Article
Demography (1967) 4 (1): 293–309.
Published: 01 March 1967
... and contains 97 items of popula- tion and housing characteristics." Among these items are the data on geographic 'C. Horace Hamilton, "Educational Selectiv- ity of Migration from Farm to Urban and to Other Nonfarm Communities," in Mobility and Mental Health, ed. Mildred B. Kantor (Spring- field, Ill.: Charles...