condition mean min max ZT0-3 621.8499999999999 621.8499999999999 621.8499999999999 ZT4-7 524.0 524.0 524.0 ZT8-11 536.25 536.25 536.25 ZT12-15 628.95 628.95 628.95 ZT16-19 609.6500000000001 609.6500000000001 609.6500000000001 ZT20-23 585.55 585.55 585.55