Month (I) Month (J) Mean Difference (I-J) Std. Error Sig. 95% Confidence Interval
Lower Bound Upper Bound
October December 1.0190* 0.24471 0.000 0.3692 1.6689
February 0.3496 0.24471 0.925 -0.3002 0.9995
April 0.8507* 0.24471 0.003 0.20085 1.5006
December October -1.0190* 0.24471 0.000 -1.6588 -0.3692
February -0.6694* 0.24471 0.040 -1.3192 -0.0195
April -0.1683 0.24471 1.000 -0.8182 0.4816
February October -0.3496 0.24471 0.925 -0.9995 0.3002
December 0.6694* 0.24471 0.040 0.0195 1.3192
April 0.5011 0.24471 0.249 -0.1488 1.1509
April October -0.8507* 0.24471 0.003 -1.5006 -0.2008
December 0.1683 0.24471 1.000 -0.4815 0.8182
February -0.5011 0.24471 0.249 -1.1509 0.1488
*The mean difference is significant at the 0.05 level
Table 1: Bonferroni multiple comparison test of means chromium concentration due to month.