condition mean min max ZT0-3 9.317683333333333 9.183254999999999 9.390115 ZT4-7 7.803375 7.803375 7.803375 ZT8-11 7.30084 7.30084 7.30084 ZT12-15 12.717425 12.52575 12.9091 ZT16-19 9.246755 9.246755 9.246755 ZT20-23 10.307805 10.307805 10.307805