condition mean min max ZT0-3 1.9488571019999998 1.091500427 2.806213777 ZT4-7 10.945317829250001 7.952532598500001 13.93810306 ZT8-11 18.751294412500002 15.705462735000001 21.79712609 ZT12-15 46.359667805 44.145721825 48.573613785 ZT16-19 60.00038494499999 57.46124844 62.539521449999995 ZT20-23 62.345413995 60.964727395 63.726100595