condition mean min max ZT0-3 1.220535 1.220535 1.220535 ZT4-7 0.9698435000000001 0.9698435000000001 0.9698435000000001 ZT8-11 1.464495 1.464495 1.464495 ZT12-15 1.86056 1.86056 1.86056 ZT16-19 1.92961 1.92961 1.92961 ZT20-23 1.303315 1.303315 1.303315