Comparing children under five years of age with elevated lead levels (greater than or equal to 5 μg/dl) for about the same duration of time pre–water switch (January 1, 2013, to April 24, 2014) to post–water switch (April 25, 2014, to September 9, 2015), the percentage increased from 1.5 percent to 8.5 percent. The p value was 0.007. In statistics, the “p value” shows statistical significance. And the lower the p value, the stronger the significance. Anything less than 0.05 is significant. There it was. Lead. It was real. The impact was there in the numbers. It was exactly what Elin had
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