condition mean min max ZT0-3 1.555059697 0.992424746 2.117694648 ZT4-7 3.552350856 2.5773708355 4.5273308765 ZT8-11 5.539737820999999 4.8437122525 6.2357633895 ZT12-15 7.05468048175 6.498756687 7.6106042765 ZT16-19 5.22227295075 4.4725160445 5.972029857000001 ZT20-23 10.14093110125 8.3571746325 11.92468757