condition mean min max ZT0-3 15.17809 15.17809 15.17809 ZT4-7 14.2309805 14.2309805 14.2309805 ZT8-11 14.6877015 14.6877015 14.6877015 ZT12-15 14.0228925 14.0228925 14.0228925 ZT16-19 13.9344635 13.9344635 13.9344635 ZT20-23 15.645476 15.645476 15.645476