condition mean min max ZT0-3 0.17745723349999998 0.10325004 0.25166442699999997 ZT4-7 1.3791569087500002 0.5670805400000001 2.1912332775000003 ZT8-11 3.6098313665 2.7286490915 4.4910136415 ZT12-15 5.07146493525 4.8712848765 5.271644994 ZT16-19 1.9362755464999997 1.5415510534999999 2.3310000394999997 ZT20-23 0.6949145754999999 0.562459001 0.8273701499999999