Table 2 Comparison of the proportion of sharks by different umbilical scar categories per month. A chi-square test indicated that there were significant associations between these two variables (P < 0.001). Standardized chi-square Pearson residuals were then used to detect significant scar-month combinations using the following criteria: (i) values less than −2 suggest that the number of observed sharks was lower than expected (bold), (ii) values greater than +2 suggest that the number of observed sharks was higher than expected (italic).
Open | Semi-healed | Healed | |
|---|---|---|---|
Sep-2014 | −2.040 | −4.333 | 5.037 |
Oct-2014 | 8.717 | 0.832 | −4.840 |
Nov-2014 | 0.956 | 2.788 | −3.075 |
Dec-2014 | 4.684 | 5.745 | −7.599 |
Jan-2015 | — | — | — |
Feb-2015 | −1.900 | 4.445 | −3.309 |
Mar-2015 | −1.800 | −3.735 | 4.362 |
Apr-2015 | −2.140 | 0.419 | 0.598 |
May-2015 | −1.030 | −1.342 | 1.745 |
Jun-2015 | −1.760 | −4.220 | 4.798 |
Jul-2015 | −1.360 | −3.431 | 3.868 |
Aug-2015 | −1.450 | 0.425 | 0.273 |
Sep-2015 | −0.990 | −2.501 | 2.819 |
Oct-2015 | −0.700 | −1.010 | 1.276 |
Nov-2015 | −0.310 | 0.886 | −0.692 |
Dec-2015 | −1.130 | 5.577 | −4.736 |
Jan-2016 | 9.054 | 3.598 | −7.607 |
Feb-2016 | −0.490 | 1.932 | −1.595 |
Mar-2016 | −0.550 | −1.749 | 1.905 |
