condition mean min max ZT0-3 55.67993333333333 47.726749999999996 69.76055 ZT4-7 36.49695 36.49695 36.49695 ZT8-11 29.2956 29.2956 29.2956 ZT12-15 34.068675 33.5383 34.59905 ZT16-19 35.6453 35.6453 35.6453 ZT20-23 47.05385 47.05385 47.05385