condition mean min max ZT0-3 29.89536 29.89536 29.89536 ZT4-7 32.13074 32.13074 32.13074 ZT8-11 28.443638 28.443638 28.443638 ZT12-15 21.201050000000002 21.201050000000002 21.201050000000002 ZT16-19 92.76213 92.76213 92.76213 ZT20-23 41.01918666666667 41.01918666666667 41.01918666666667