condition mean min max ZT0-3 12.939725 11.99785 13.881599999999999 ZT4-7 11.879100000000001 11.879100000000001 11.879100000000001 ZT8-11 10.31955 10.31955 10.31955 ZT12-15 0 0 0 ZT16-19 12.044350000000001 12.044350000000001 12.044350000000001 ZT20-23 12.8348 12.8348 12.8348