condition mean min max ZT0-3 1.813379 1.264492 2.74115 ZT4-7 0.1708635 0.1708635 0.1708635 ZT8-11 1.258745 1.258745 1.258745 ZT12-15 1.69258 1.12212 2.26304 ZT16-19 2.377165 2.377165 2.377165 ZT20-23 3.4521800000000002 3.4521800000000002 3.4521800000000002