condition mean min max ZT0-3 13.629613 13.629613 13.629613 ZT4-7 15.8138225 15.8138225 15.8138225 ZT8-11 13.7336815 13.7336815 13.7336815 ZT12-15 12.5477895 12.5477895 12.5477895 ZT16-19 13.129088 13.129088 13.129088 ZT20-23 14.3091235 14.3091235 14.3091235