condition mean min max ZT0-3 3.0999999999999996 3.0999999999999996 3.0999999999999996 ZT4-7 51.6 51.6 51.6 ZT8-11 3.55 3.55 3.55 ZT12-15 4.949999999999999 4.949999999999999 4.949999999999999 ZT16-19 5.3 5.3 5.3 ZT20-23 7.15 7.15 7.15