condition mean min max ZT0-3 74.115625 74.115625 74.115625 ZT4-7 68.459175 68.459175 68.459175 ZT8-11 80.54365 80.54365 80.54365 ZT12-15 82.27485833333333 82.27485833333333 82.27485833333333 ZT16-19 73.639 73.639 73.639 ZT20-23 74.12425 74.12425 74.12425