condition mean min max ZT0-3 2.08786 2.08786 2.08786 ZT4-7 1.291105 1.291105 1.291105 ZT8-11 1.201985 1.201985 1.201985 ZT12-15 1.39276 1.39276 1.39276 ZT16-19 2.373465 2.373465 2.373465 ZT20-23 2.326345 2.326345 2.326345