condition mean min max ZT0-3 262.097725 262.097725 262.097725 ZT4-7 299.4579365 299.4579365 299.4579365 ZT8-11 280.9393575 280.9393575 280.9393575 ZT12-15 292.6470905 292.6470905 292.6470905 ZT16-19 322.904216 322.904216 322.904216 ZT20-23 374.411851 374.411851 374.411851