condition mean min max ZT0-3 52.409964 52.409964 52.409964 ZT4-7 53.0658415 53.0658415 53.0658415 ZT8-11 52.0004805 52.0004805 52.0004805 ZT12-15 46.8475295 46.8475295 46.8475295 ZT16-19 48.6225805 48.6225805 48.6225805 ZT20-23 47.705384 47.705384 47.705384