condition mean min max ZT0-3 17.499650000000003 15.42455 19.57475 ZT4-7 10.15335 10.15335 10.15335 ZT8-11 8.538609999999998 8.538609999999998 8.538609999999998 ZT12-15 0 0 0 ZT16-19 11.9955 11.9955 11.9955 ZT20-23 14.0314 14.0314 14.0314