condition mean min max ZT0-3 12.468428333333334 10.303035 14.0252 ZT4-7 12.045300000000001 12.045300000000001 12.045300000000001 ZT8-11 14.51345 14.51345 14.51345 ZT12-15 27.076974999999997 26.5492 27.60475 ZT16-19 20.353 20.353 20.353 ZT20-23 17.216299999999997 17.216299999999997 17.216299999999997