condition mean min max ZT0-3 8.519238056749998 7.823254205 9.215221908499998 ZT4-7 10.201853883750001 8.424084198500001 11.979623569 ZT8-11 20.058973117500003 16.161893195 23.95605304 ZT12-15 12.675118655999999 8.5956256605 16.7546116515 ZT16-19 4.845546100750001 4.813316609 4.877775592500001 ZT20-23 4.529261771750001 4.4557083835 4.6028151600000005