condition mean min max ZT0-3 299.666372 299.666372 299.666372 ZT4-7 527.96369 527.96369 527.96369 ZT8-11 730.9956725 730.9956725 730.9956725 ZT12-15 641.8402215 641.8402215 641.8402215 ZT16-19 486.5012875 486.5012875 486.5012875 ZT20-23 515.3902025 515.3902025 515.3902025