condition mean min max ZT0-3 0.53709975 0.441423 0.6327765 ZT4-7 0.6111500000000001 0.6111500000000001 0.6111500000000001 ZT8-11 2.5872849999999996 2.5872849999999996 2.5872849999999996 ZT12-15 0 0 0 ZT16-19 1.936455 1.936455 1.936455 ZT20-23 0.937986 0.937986 0.937986