Box plots depicting the increase in cell death after 1, 2 or 3 days of consecutive PEMF treatment.

<p>(<b>A</b>) 3 mT PEMFs for 60 min/day impaired MCF7 cancer cell viability sufficiently to cause a time-dependent accumulation of compromised cells over the time course of 1 to 3 days. The most significant degree of cell impairment was seen after 3 days (4 independent experiments with 3 replicates/experiment (n = 12)) (p-values, left to right: 0.3246, 0.02032, 0.00004) (also see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0072944#pone-0072944-t001" target="_blank">Table 1</a> for the mean, high value, low value and average absolute deviation from median). (<b>B</b>) MCF7 cancer cells treated with 3 mT PEMFs for 90 min/day for 1, 2 or 3 days. Overall, 90 min/day of exposure produced less cytotoxicity than 60 min/day. Data were generated from 4 independent experiments with 2 replicates/experiment (n = 8) (p-values, left to right: 0.2595, 0.02953, 0.00015) (also see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0072944#pone-0072944-t002" target="_blank">table 2</a> for the mean, high value, low value and average absolute deviation from median).