condition mean min max ZT0-3 22.86945 22.86945 22.86945 ZT4-7 22.823700000000002 22.823700000000002 22.823700000000002 ZT8-11 21.548000000000002 21.548000000000002 21.548000000000002 ZT12-15 20.42205 20.42205 20.42205 ZT16-19 22.5928 22.5928 22.5928 ZT20-23 22.0001 22.0001 22.0001