condition mean min max ZT0-3 0.793705 0.793705 0.793705 ZT4-7 0.337287 0.337287 0.337287 ZT8-11 0.2314775 0.2314775 0.2314775 ZT12-15 1.6630099999999999 1.6630099999999999 1.6630099999999999 ZT16-19 3.71436 3.71436 3.71436 ZT20-23 2.14489 2.14489 2.14489