condition mean min max ZT0-3 0.6848540000000001 0.4448415 0.8596675 ZT4-7 1.90626 1.90626 1.90626 ZT8-11 17.921300000000002 17.921300000000002 17.921300000000002 ZT12-15 7.918295 7.9037749999999996 7.932815 ZT16-19 7.872305 7.872305 7.872305 ZT20-23 4.025395 4.025395 4.025395