condition mean min max ZT0-3 39.65 39.65 39.65 ZT4-7 28.5 28.5 28.5 ZT8-11 36.900000000000006 36.900000000000006 36.900000000000006 ZT12-15 44.5 44.5 44.5 ZT16-19 30.299999999999997 30.299999999999997 30.299999999999997 ZT20-23 49.900000000000006 49.900000000000006 49.900000000000006