condition mean min max ZT0-3 23.894583333333333 19.775199999999998 27.51485 ZT4-7 32.647 32.647 32.647 ZT8-11 28.27965 28.27965 28.27965 ZT12-15 32.484375 32.23115 32.7376 ZT16-19 25.9651 25.9651 25.9651 ZT20-23 25.6922 25.6922 25.6922