condition mean min max ZT0-3 47.402249999999995 42.12915 52.675349999999995 ZT4-7 48.0531 48.0531 48.0531 ZT8-11 31.6438 31.6438 31.6438 ZT12-15 0 0 0 ZT16-19 34.15875 34.15875 34.15875 ZT20-23 48.7913 48.7913 48.7913