condition mean min max ZT0-3 28.7652 28.7652 28.7652 ZT4-7 25.0793 25.0793 25.0793 ZT8-11 31.3187 31.3187 31.3187 ZT12-15 26.8539 26.8539 26.8539 ZT16-19 41.67995 41.67995 41.67995 ZT20-23 31.9815 31.9815 31.9815