condition mean min max ZT0-3 0.614217 0.614217 0.614217 ZT4-7 0.2285725 0.2285725 0.2285725 ZT8-11 0.09172274999999999 0.09172274999999999 0.09172274999999999 ZT12-15 0.6197765 0.6197765 0.6197765 ZT16-19 1.163345 1.163345 1.163345 ZT20-23 0.9202170000000001 0.9202170000000001 0.9202170000000001