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Table 1 Summarized data on the monthly number of field days and relative index of sampling effort used to estimate the expected monthly number of snakes

From: Correlation between annual activity patterns of venomous snakes and rural people in the Niger Delta, southern Nigeria

  Number of days in the field Relative index
Jan 144 0.0775
Feb 143 0.0770
Mar 151 0.0813
Apr 156 0.0840
May 155 0.0835
Jun 149 0.0802
Jul 162 0.0872
Aug 177 0.0953
Sep 161 0.0867
Oct 142 0.0765
Nov 150 0.0808
Dec 167 0.0899
Total 1857