condition mean min max ZT0-3 1.5321916666666666 0.0 3.476285 ZT4-7 0.4080325 0.4080325 0.4080325 ZT8-11 0.0 0.0 0.0 ZT12-15 1.4293974999999999 1.149705 1.70909 ZT16-19 2.07607 2.07607 2.07607 ZT20-23 1.80067 1.80067 1.80067