condition mean min max ZT0-3 36.521012945 25.457621250000003 47.58440464 ZT4-7 19.353238642500003 18.794752115 19.91172517 ZT8-11 23.6175226 17.728770435 29.506274765 ZT12-15 27.490527545 26.204823855 28.776231234999997 ZT16-19 33.8128419125 30.687959069999998 36.937724755 ZT20-23 43.3797600875 36.553325415 50.20619476