condition mean min max ZT0-3 26.32868 26.32868 26.32868 ZT4-7 22.042295000000003 22.042295000000003 22.042295000000003 ZT8-11 18.752266 18.752266 18.752266 ZT12-15 24.717616 24.717616 24.717616 ZT16-19 22.465594000000003 22.465594000000003 22.465594000000003 ZT20-23 25.2774285 25.2774285 25.2774285