condition mean min max ZT0-3 5.8481725 4.843635 6.85271 ZT4-7 5.05626 5.05626 5.05626 ZT8-11 5.811225 5.811225 5.811225 ZT12-15 0 0 0 ZT16-19 7.84291 7.84291 7.84291 ZT20-23 7.37275 7.37275 7.37275