condition mean min max ZT0-3 5.454638893249999 5.157141165 5.7521366215 ZT4-7 3.4403332339999997 3.157724084 3.7229423839999995 ZT8-11 3.5808536912499997 2.5393047715 4.622402611 ZT12-15 4.0627035355 3.66337524 4.462031831 ZT16-19 4.72691515775 4.302430872 5.1513994435 ZT20-23 7.09476484025 7.0331232 7.156406480499999