condition mean min max ZT0-3 13.349157 13.349157 13.349157 ZT4-7 13.9314335 13.9314335 13.9314335 ZT8-11 13.1345155 13.1345155 13.1345155 ZT12-15 16.510773 16.510773 16.510773 ZT16-19 12.519752 12.519752 12.519752 ZT20-23 14.1964905 14.1964905 14.1964905