condition mean min max ZT0-3 262.195622 262.195622 262.195622 ZT4-7 291.2436 291.2436 291.2436 ZT8-11 279.977008 279.977008 279.977008 ZT12-15 274.9191305 274.9191305 274.9191305 ZT16-19 265.643137 265.643137 265.643137 ZT20-23 201.95302900000002 201.95302900000002 201.95302900000002