condition mean min max ZT0-3 22.699813 22.699813 22.699813 ZT4-7 23.4745755 23.4745755 23.4745755 ZT8-11 21.851517 21.851517 21.851517 ZT12-15 21.553492 21.553492 21.553492 ZT16-19 23.5014325 23.5014325 23.5014325 ZT20-23 22.566969 22.566969 22.566969