condition mean min max ZT0-3 13.059098 13.059098 13.059098 ZT4-7 26.405994 26.405994 26.405994 ZT8-11 34.235443 34.235443 34.235443 ZT12-15 23.0125165 23.0125165 23.0125165 ZT16-19 15.480091 15.480091 15.480091 ZT20-23 12.902013499999999 12.902013499999999 12.902013499999999