condition mean min max ZT0-3 4.6907309805 3.9457046669999998 5.435757294 ZT4-7 8.477958229750001 8.080985672 8.8749307875 ZT8-11 10.166786255 9.2942011405 11.0393713695 ZT12-15 24.80706429 22.86528067 26.748847910000002 ZT16-19 31.488297002499998 30.036676435 32.93991757 ZT20-23 49.91523566 45.40480273 54.42566859