condition mean min max ZT0-3 9.782817970916668 9.5181858915 10.047450050333333 ZT4-7 8.712545319 6.852586063 10.572504575 ZT8-11 8.397345908166667 7.153322819 9.641368997333334 ZT12-15 12.904450771 11.794427435333333 14.014474106666666 ZT16-19 11.596587649666667 11.43309932 11.760075979333333 ZT20-23 10.5952663605 10.249328188 10.941204533