condition mean min max ZT0-3 2.301025 1.347305 3.02225 ZT4-7 0.7785139999999999 0.7785139999999999 0.7785139999999999 ZT8-11 1.264915 1.264915 1.264915 ZT12-15 1.651795 1.61205 1.69154 ZT16-19 1.94892 1.94892 1.94892 ZT20-23 3.011625 3.011625 3.011625