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Table 2 Mortality rate between January 2014 and April 2016 in C. perspicillata colony

From: Yersinia pseudotuberculosis serotype O:1 infection in a captive Seba’s short tailed-fruit bat (Carollia perspicillata) colony in Switzerland

Month Newborn Young Adult Unknown Total Coefficient t-value
Jan 14   2 1   3 −0.192 − 0.122
Feb 14   1 1   2 − 1.446 − 0.916
Mar 14   4 4   8 4.907 3.106
Apr 14   1    1 −2.358 −1.493
May 14   1    1 −2.137 −1.353
Jun 14 1 1   1 3 −0.402 −0.255
Jul 14 2 2 2 3 9 5.73 3.627
Aug 14   2 2   4 0.465 0.295
Sep 14    4   4 0.642 0.406
Oct 14 1 1 2 1 5 1.73 1.095
Nov 14   1 2   3 −0.314 −0.199
Dec 14   1 2   3 −0.137 −0.087
Jan 15 1     1 −2.137 −1.353
Feb 15   1    1 −2.182 −1.381
Mar 15   2 2   4 0.907 0.574
Apr 15    1 1 2 −1.137 −0.72
May 15      0 −3.182 −2.014
Jun 15   1 2   3 −0.049 − 0.031
Jul 15    2   2 −1.137 −0.72
Aug 15    1   1 −2.137 −1.353
Sep 15   1 1   2 −1.137 −0.72
Oct 15    3   3 −0.358 −0.227
Nov 15   2 1 4 7 3.818 2.417
Dec 15    2   2 −1.491 −0.943
Jan 16 1   3 1 5 1.686 1.067
Feb 16   1 5   6 2.642 1.672
Mar 16   3 1   4 0.686 0.434
Apr 16 1 1    2 −1.281 −0.81
  1. The coefficients and t-values of the outliers’ detection analysis was performed only on the total number of dead bats. The critical value was set at 3.5 and significant t-value (July 2014) is in bold. This finding was attributed to an ongoing birth peak in combination with increased stress due to an unusually high number of visitors