condition mean min max ZT0-3 172.732279 172.732279 172.732279 ZT4-7 142.83686649999999 142.83686649999999 142.83686649999999 ZT8-11 134.9285725 134.9285725 134.9285725 ZT12-15 125.4210955 125.4210955 125.4210955 ZT16-19 135.632392 135.632392 135.632392 ZT20-23 167.5516595 167.5516595 167.5516595