condition mean min max ZT0-3 30.486409 30.486409 30.486409 ZT4-7 47.86377 47.86377 47.86377 ZT8-11 22.205556 22.205556 22.205556 ZT12-15 16.5859205 16.5859205 16.5859205 ZT16-19 12.0555135 12.0555135 12.0555135 ZT20-23 12.2088525 12.2088525 12.2088525