condition mean min max ZT0-3 4.9625217635 4.8779633019999995 5.047080225 ZT4-7 4.67104239525 3.928197572 5.4138872185 ZT8-11 13.5383780865 8.698643318 18.378112855 ZT12-15 17.8967937675 17.353368539999998 18.440218995 ZT16-19 11.332955493 10.530818623 12.135092363 ZT20-23 6.35675800925 4.9961255375 7.717390481