condition mean min max ZT0-3 9.23042995375 4.125230567499999 14.33562934 ZT4-7 5.5984024955 4.213666014 6.983138976999999 ZT8-11 5.713689809249999 5.01833073 6.409048888499999 ZT12-15 3.8877590855 3.8237292985 3.9517888725 ZT16-19 5.94966646275 5.260280706 6.6390522195 ZT20-23 6.328894089 5.490916616 7.166871562000001