condition mean min max ZT0-3 6.003905 5.439855 6.5679549999999995 ZT4-7 4.4599150000000005 4.4599150000000005 4.4599150000000005 ZT8-11 5.572245000000001 5.572245000000001 5.572245000000001 ZT12-15 0 0 0 ZT16-19 7.447255 7.447255 7.447255 ZT20-23 6.20664 6.20664 6.20664