condition mean min max ZT0-3 2.0348160980000003 1.311475674 2.758156522 ZT4-7 2.70773850675 2.4178027020000004 2.9976743115 ZT8-11 2.4235606085 2.420338387 2.42678283 ZT12-15 3.43983174125 2.599143457 4.2805200254999995 ZT16-19 3.7414914185000003 3.3983638440000004 4.084618993 ZT20-23 5.836220078749999 5.2499767355 6.422463422