condition mean min max ZT0-3 0.45291075000000003 0.44942550000000003 0.456396 ZT4-7 1.6920199999999999 1.6920199999999999 1.6920199999999999 ZT8-11 1.1395625 1.1395625 1.1395625 ZT12-15 0 0 0 ZT16-19 0.6285685000000001 0.6285685000000001 0.6285685000000001 ZT20-23 1.80508 1.80508 1.80508