condition mean min max ZT0-3 27.555631 27.555631 27.555631 ZT4-7 25.0138055 25.0138055 25.0138055 ZT8-11 27.574252 27.574252 27.574252 ZT12-15 35.361341 35.361341 35.361341 ZT16-19 30.773297 30.773297 30.773297 ZT20-23 39.009283 39.009283 39.009283