condition mean min max ZT0-3 5.34553054 4.759617972000001 5.931443108 ZT4-7 8.40932438475 5.2010945594999995 11.617554210000002 ZT8-11 22.70526721 18.59061765 26.81991677 ZT12-15 27.167576355 26.878028810000004 27.4571239 ZT16-19 34.809879214999995 33.145648615 36.474109815 ZT20-23 44.9710513575 40.080909115 49.8611936