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Table 2 Month-specific total number of non-national births, multiple sclerosis births, estimates of expected relative incidence, observed relative incidence (ORI) and ORI ranks: Kuwait, January 1, 1950 – April 30, 2013

From: Non-parametric analysis of seasonality in birth and multiple sclerosis risk in second generation of migrants in Kuwait

Months Non-national births (n = 997269) MS births (n = 237) Expected relative incidence (×103) Observed relative incidence (×103) ORI rank
Jan 86425 18 0.020184 0.017689 5
Feb 74731 22 0.018231 0.022583 10
Mar 81849 17 0.020184 0.01764 4
Apr 80364 28 0.019533 0.028637 12
May 82865 15 0.020184 0.015374 2
June 80451 14 0.019533 0.014303 1
July 84331 17 0.020184 0.017121 3
Aug 83502 20 0.020184 0.020342 8
Sept 83339 20 0.019533 0.019725 7
Oct 86868 24 0.020184 0.023465 11
Nov 84524 22 0.019533 0.021393 9
Dec 88020 20 0.020184 0.019298 6