condition mean min max ZT0-3 0.8940883482499999 0.500688269 1.2874884275 ZT4-7 2.1031296745 1.5946152850000002 2.611644064 ZT8-11 5.84854133 4.224303312 7.4727793479999995 ZT12-15 10.05626873225 7.374481804 12.7380556605 ZT16-19 7.1141816989999995 6.060405617 8.167957781 ZT20-23 12.6969215825 12.29321373 13.100629435