condition mean min max ZT0-3 3.4738175 2.57254 4.375095 ZT4-7 49.9547 49.9547 49.9547 ZT8-11 49.8451 49.8451 49.8451 ZT12-15 0 0 0 ZT16-19 10.367135 10.367135 10.367135 ZT20-23 7.23349 7.23349 7.23349