condition mean min max ZT0-3 4.0629575 3.941105 4.184810000000001 ZT4-7 2.876355 2.876355 2.876355 ZT8-11 4.7572600000000005 4.7572600000000005 4.7572600000000005 ZT12-15 0 0 0 ZT16-19 6.581495 6.581495 6.581495 ZT20-23 5.916075 5.916075 5.916075