condition mean min max ZT0-3 966.3 966.3 966.3 ZT4-7 791.2 791.2 791.2 ZT8-11 552.8499999999999 552.8499999999999 552.8499999999999 ZT12-15 728.45 728.45 728.45 ZT16-19 750.6500000000001 750.6500000000001 750.6500000000001 ZT20-23 733.55 733.55 733.55