condition mean min max ZT0-3 51.686525 49.956900000000005 53.41615 ZT4-7 40.26045 40.26045 40.26045 ZT8-11 63.91515 63.91515 63.91515 ZT12-15 0 0 0 ZT16-19 71.59985 71.59985 71.59985 ZT20-23 65.0465 65.0465 65.0465