condition mean min max ZT0-3 2.08887 1.98031 2.1974299999999998 ZT4-7 2.92058 2.92058 2.92058 ZT8-11 3.81213 3.81213 3.81213 ZT12-15 0 0 0 ZT16-19 3.118935 3.118935 3.118935 ZT20-23 3.01955 3.01955 3.01955