condition mean min max ZT0-3 1.6834814484999998 1.388885273 1.9780776239999998 ZT4-7 1.84275993525 1.2616261815 2.423893689 ZT8-11 3.088610523 2.3880825955 3.7891384505000003 ZT12-15 4.6228130685 3.9880395635 5.2575865735 ZT16-19 3.51504450875 3.3443161975 3.68577282 ZT20-23 4.8206615595 4.778466543 4.862856576