condition mean min max ZT0-3 389.585123 389.585123 389.585123 ZT4-7 359.5446995 359.5446995 359.5446995 ZT8-11 472.1914415 472.1914415 472.1914415 ZT12-15 463.018857 463.018857 463.018857 ZT16-19 594.5921020000001 594.5921020000001 594.5921020000001 ZT20-23 639.621338 639.621338 639.621338