condition mean min max ZT0-3 71.15 71.15 71.15 ZT4-7 11.2 11.2 11.2 ZT8-11 6.949999999999999 6.949999999999999 6.949999999999999 ZT12-15 4.2 4.2 4.2 ZT16-19 30.2 30.2 30.2 ZT20-23 48.65 48.65 48.65