condition mean min max ZT0-3 59.034181 59.034181 59.034181 ZT4-7 53.0550185 53.0550185 53.0550185 ZT8-11 65.69017149999999 65.69017149999999 65.69017149999999 ZT12-15 76.6896115 76.6896115 76.6896115 ZT16-19 68.1401285 68.1401285 68.1401285 ZT20-23 42.816584 42.816584 42.816584