condition mean min max ZT0-3 3.6516056382500004 3.4232683535 3.879942923 ZT4-7 5.09721357025 3.3278737805 6.86655336 ZT8-11 10.187722335500002 8.694985041 11.680459630000001 ZT12-15 14.646378745 12.288059109999999 17.00469838 ZT16-19 13.252595395 12.991598555 13.513592235 ZT20-23 14.796781557500001 14.04852376 15.545039355