condition mean min max ZT0-3 0.92193 0.92193 0.92193 ZT4-7 1.3288289999999998 1.3288289999999998 1.3288289999999998 ZT8-11 1.1461299999999999 1.1461299999999999 1.1461299999999999 ZT12-15 1.14282 1.14282 1.14282 ZT16-19 0.99786 0.99786 0.99786 ZT20-23 1.1826243333333333 1.1826243333333333 1.1826243333333333