condition mean min max ZT0-3 11.895225 11.895225 11.895225 ZT4-7 12.320933499999999 12.320933499999999 12.320933499999999 ZT8-11 11.0643 11.0643 11.0643 ZT12-15 10.639883999999999 10.639883999999999 10.639883999999999 ZT16-19 11.19405 11.19405 11.19405 ZT20-23 10.988791500000001 10.988791500000001 10.988791500000001