condition mean min max ZT0-3 17.79548381 16.43216541 19.15880221 ZT4-7 6.721870083 6.194533819 7.249206346999999 ZT8-11 40.866911618 11.297071791 70.436751445 ZT12-15 95.802172015 95.20318562 96.40115841 ZT16-19 53.48475854 44.351424365 62.618092715 ZT20-23 35.108812885 34.300055244999996 35.917570525