condition mean min max ZT0-3 1.1307118420000002 0.9599753240000002 1.30144836 ZT4-7 2.8288676245 2.340677715 3.317057534 ZT8-11 7.9783129545 5.951801412 10.004824497 ZT12-15 12.89887149 12.34285366 13.45488932 ZT16-19 12.00341045325 10.9665296115 13.040291295 ZT20-23 12.79734371 12.677812825 12.916874595