condition mean min max ZT0-3 196.5753702 181.9315914 211.21914900000002 ZT4-7 86.93271153500001 82.00570755000001 91.85971552 ZT8-11 42.6857854325 36.42663694 48.944933925 ZT12-15 19.349552205 15.96999101 22.7291134 ZT16-19 38.8989833 30.979804 46.8181626 ZT20-23 69.696098895 61.81301995999999 77.57917783