condition mean min max ZT0-3 36.84471666666667 33.79705 39.2721 ZT4-7 43.9441 43.9441 43.9441 ZT8-11 61.1527 61.1527 61.1527 ZT12-15 71.0512 69.92885 72.17355 ZT16-19 62.06455 62.06455 62.06455 ZT20-23 46.10575 46.10575 46.10575