condition mean min max ZT0-3 53.84275 44.3877 61.81 ZT4-7 44.56625 44.56625 44.56625 ZT8-11 24.29305 24.29305 24.29305 ZT12-15 35.058875 31.4583 38.65945 ZT16-19 30.25875 30.25875 30.25875 ZT20-23 34.95545 34.95545 34.95545