condition mean min max ZT0-3 16.650033 16.650033 16.650033 ZT4-7 13.1039995 13.1039995 13.1039995 ZT8-11 13.975964 13.975964 13.975964 ZT12-15 13.231775 13.231775 13.231775 ZT16-19 15.951837000000001 15.951837000000001 15.951837000000001 ZT20-23 14.558798 14.558798 14.558798