condition mean min max ZT0-3 4.3183256645 3.50140055 5.135250779 ZT4-7 8.1120394215 6.2530122939999995 9.971066549 ZT8-11 22.83118433075 15.8358206415 29.82654802 ZT12-15 30.2994092525 28.81309014 31.785728364999997 ZT16-19 16.1516448575 15.74207643 16.561213285 ZT20-23 19.1122924275 18.554309695 19.67027516