condition mean min max ZT0-3 12.03743383475 10.7009650895 13.37390258 ZT4-7 7.896352230749999 7.795393145999999 7.997311315499999 ZT8-11 10.9168332945 8.178887369 13.65477922 ZT12-15 11.38986792075 10.7746865455 12.005049296 ZT16-19 13.7178674625 12.20197724 15.233757685 ZT20-23 18.18352308 16.983022565 19.384023595000002