condition mean min max ZT0-3 10.631440000000001 10.607800000000001 10.65508 ZT4-7 13.037749999999999 13.037749999999999 13.037749999999999 ZT8-11 15.9524 15.9524 15.9524 ZT12-15 0 0 0 ZT16-19 19.21 19.21 19.21 ZT20-23 17.1554 17.1554 17.1554