condition mean min max ZT0-3 35.949725 35.93935 35.9601 ZT4-7 25.360550000000003 25.360550000000003 25.360550000000003 ZT8-11 26.46905 26.46905 26.46905 ZT12-15 0 0 0 ZT16-19 31.13335 31.13335 31.13335 ZT20-23 52.53115 52.53115 52.53115