condition mean min max ZT0-3 0.0834245 0.0 0.2502735 ZT4-7 0.0 0.0 0.0 ZT8-11 0.0 0.0 0.0 ZT12-15 0.0 0.0 0.0 ZT16-19 0.0 0.0 0.0 ZT20-23 0.5386415 0.5386415 0.5386415