condition mean min max ZT0-3 0.9386555 0.0 1.877311 ZT4-7 0.0 0.0 0.0 ZT8-11 0.290976 0.290976 0.290976 ZT12-15 0.6112241666666667 0.0 1.2224483333333334 ZT16-19 0.4274 0.4274 0.4274 ZT20-23 0.613785 0.613785 0.613785