condition mean min max ZT0-3 4.2081075 4.1192899999999995 4.296925 ZT4-7 4.86777 4.86777 4.86777 ZT8-11 4.68447 4.68447 4.68447 ZT12-15 0 0 0 ZT16-19 6.484735000000001 6.484735000000001 6.484735000000001 ZT20-23 5.9091000000000005 5.9091000000000005 5.9091000000000005