condition mean min max ZT0-3 9.950945 9.950945 9.950945 ZT4-7 9.258714999999999 9.258714999999999 9.258714999999999 ZT8-11 7.60505 7.60505 7.60505 ZT12-15 7.1455 7.1455 7.1455 ZT16-19 11.398295000000001 11.398295000000001 11.398295000000001 ZT20-23 9.784535 9.784535 9.784535