condition mean min max ZT0-3 74.957994 74.957994 74.957994 ZT4-7 129.710586 129.710586 129.710586 ZT8-11 149.75879750000001 149.75879750000001 149.75879750000001 ZT12-15 161.500518 161.500518 161.500518 ZT16-19 124.513862 124.513862 124.513862 ZT20-23 66.5823325 66.5823325 66.5823325