condition mean min max ZT0-3 0.52868375 0.355 0.7023675 ZT4-7 0.792872 0.792872 0.792872 ZT8-11 0.2828025 0.2828025 0.2828025 ZT12-15 0 0 0 ZT16-19 0.20959499999999998 0.20959499999999998 0.20959499999999998 ZT20-23 0.42043600000000003 0.42043600000000003 0.42043600000000003