condition mean min max ZT0-3 7.156242499999999 6.224819999999999 8.087665 ZT4-7 7.706385000000001 7.706385000000001 7.706385000000001 ZT8-11 32.778800000000004 32.778800000000004 32.778800000000004 ZT12-15 0 0 0 ZT16-19 26.7489 26.7489 26.7489 ZT20-23 14.96525 14.96525 14.96525