condition mean min max ZT0-3 5.47952 5.47952 5.47952 ZT4-7 4.227715 4.227715 4.227715 ZT8-11 4.373115 4.373115 4.373115 ZT12-15 5.598255 5.598255 5.598255 ZT16-19 6.390255 6.390255 6.390255 ZT20-23 5.462295 5.462295 5.462295