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Month of birth and level of insolation as risk factors for multiple sclerosis in Poland

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ABSTRACT

Introduction: Many studies have shown that people born in the spring are at a higher risk of developing multiple sclerosis (MS). This may be associated with lower levels of sun exposure, and consequently, lower levels of vitamin D3 during pregnancy. However, these relationships have not been verified thus far in any countries in Central Europe.

Objective: The aim of our study was to determine the frequency distribution of births for each calendar month in patients suffering from MS in Poland.

Methods: We analyzed data for 2574 patients diagnosed with MS (1758 women, 816 men) living in Poland for an extended period. We added corrections resulting from the frequency distribution of births for the years in which the patients were born. We applied the Hewitt test for seasonality with Rogerson modification for 3-, 4-, or 6-month pulses or periods. Moreover, we examined the average number hours of sunshine in every month of the year.

Results: The rank-sums for successive 3- and 4-month segments indicated the period from September to December and from October to December as having a significantly lower incidence (p = 0.027 and p = 0.054, respectively). We did not find a correlation between with hours of sunshine in the first trimester of pregnancy, the child’s birth month, and the child developing MS.

Conclusions: We were able to confirm a seasonal variation in the risk of MS in Poland. However, these findings did not correlate with hours of sunshine during the first trimester of pregnancy.

No MeSH data available.


Related in: MedlinePlus

Correlation between insolation in the first trimester of pregnancy and number of SM births.
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pone.0175156.g003: Correlation between insolation in the first trimester of pregnancy and number of SM births.

Mentions: We have not determined a correlation between insolation in the first trimester of pregnancy and child’s birth month for those that developed MS (R = 0.254; Fig 3).


Month of birth and level of insolation as risk factors for multiple sclerosis in Poland
Correlation between insolation in the first trimester of pregnancy and number of SM births.
© Copyright Policy
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5383232&req=5

pone.0175156.g003: Correlation between insolation in the first trimester of pregnancy and number of SM births.
Mentions: We have not determined a correlation between insolation in the first trimester of pregnancy and child’s birth month for those that developed MS (R = 0.254; Fig 3).

View Article: PubMed Central - PubMed

ABSTRACT

Introduction: Many studies have shown that people born in the spring are at a higher risk of developing multiple sclerosis (MS). This may be associated with lower levels of sun exposure, and consequently, lower levels of vitamin D3 during pregnancy. However, these relationships have not been verified thus far in any countries in Central Europe.

Objective: The aim of our study was to determine the frequency distribution of births for each calendar month in patients suffering from MS in Poland.

Methods: We analyzed data for 2574 patients diagnosed with MS (1758 women, 816 men) living in Poland for an extended period. We added corrections resulting from the frequency distribution of births for the years in which the patients were born. We applied the Hewitt test for seasonality with Rogerson modification for 3-, 4-, or 6-month pulses or periods. Moreover, we examined the average number hours of sunshine in every month of the year.

Results: The rank-sums for successive 3- and 4-month segments indicated the period from September to December and from October to December as having a significantly lower incidence (p = 0.027 and p = 0.054, respectively). We did not find a correlation between with hours of sunshine in the first trimester of pregnancy, the child’s birth month, and the child developing MS.

Conclusions: We were able to confirm a seasonal variation in the risk of MS in Poland. However, these findings did not correlate with hours of sunshine during the first trimester of pregnancy.

No MeSH data available.


Related in: MedlinePlus