condition mean min max ZT0-3 1.639542 0.689026 2.523935 ZT4-7 0.9756315 0.9756315 0.9756315 ZT8-11 0.168239 0.168239 0.168239 ZT12-15 0.39001325 0.3607405 0.419286 ZT16-19 0.9542505 0.9542505 0.9542505 ZT20-23 0.3631985 0.3631985 0.3631985