condition mean min max ZT0-3 0.2587935 0.2587935 0.2587935 ZT4-7 1.86165 1.86165 1.86165 ZT8-11 97.5239 97.5239 97.5239 ZT12-15 140.926 140.926 140.926 ZT16-19 29.60725 29.60725 29.60725 ZT20-23 0.32225800000000004 0.32225800000000004 0.32225800000000004