condition mean min max ZT0-3 1.0624325000000001 1.0624325000000001 1.0624325000000001 ZT4-7 0.6677744999999999 0.6677744999999999 0.6677744999999999 ZT8-11 0.459815 0.459815 0.459815 ZT12-15 1.0314800000000002 1.0314800000000002 1.0314800000000002 ZT16-19 2.003725 2.003725 2.003725 ZT20-23 1.361885 1.361885 1.361885