condition mean min max ZT0-3 12.198388 12.198388 12.198388 ZT4-7 12.802956 12.802956 12.802956 ZT8-11 12.6970105 12.6970105 12.6970105 ZT12-15 11.171701 11.171701 11.171701 ZT16-19 13.063015499999999 13.063015499999999 13.063015499999999 ZT20-23 12.574535000000001 12.574535000000001 12.574535000000001