condition mean min max ZT0-3 8.151851977749999 6.2224847355 10.08121922 ZT4-7 5.8008764655 4.8084728875 6.793280043499999 ZT8-11 5.01197143425 4.8413047915 5.182638077 ZT12-15 3.5677786007499996 3.472583478 3.6629737235 ZT16-19 3.4803676765000002 2.6958176035 4.2649177495 ZT20-23 7.5449936575 6.024215326 9.065771989