condition mean min max ZT0-3 118.622039 118.622039 118.622039 ZT4-7 130.145533 130.145533 130.145533 ZT8-11 133.933262 133.933262 133.933262 ZT12-15 150.599788 150.599788 150.599788 ZT16-19 168.108974 168.108974 168.108974 ZT20-23 150.297965 150.297965 150.297965