condition mean min max ZT0-3 4.33206 4.33206 4.33206 ZT4-7 3.5078 3.5078 3.5078 ZT8-11 4.3220600000000005 4.3220600000000005 4.3220600000000005 ZT12-15 5.90152 5.90152 5.90152 ZT16-19 5.0611250000000005 5.0611250000000005 5.0611250000000005 ZT20-23 4.446875 4.446875 4.446875