condition mean min max ZT0-3 2.46753 2.46753 2.46753 ZT4-7 1.66683 1.66683 1.66683 ZT8-11 2.07376 2.07376 2.07376 ZT12-15 3.8404949999999998 3.8404949999999998 3.8404949999999998 ZT16-19 4.0542 4.0542 4.0542 ZT20-23 2.7853899999999996 2.7853899999999996 2.7853899999999996