condition mean min max ZT0-3 3.59974992225 1.705469417 5.4940304275 ZT4-7 7.0149502340000005 6.3127990335 7.7171014345 ZT8-11 7.87204889675 6.953703456 8.7903943375 ZT12-15 6.3793984665 6.1778114275 6.580985505499999 ZT16-19 5.303278583 4.8447373625 5.7618198035 ZT20-23 3.8714403765 3.7711658194999993 3.9717149335000004