condition mean min max ZT0-3 9.843086 9.843086 9.843086 ZT4-7 9.6731295 9.6731295 9.6731295 ZT8-11 9.6675635 9.6675635 9.6675635 ZT12-15 9.0616055 9.0616055 9.0616055 ZT16-19 9.6683335 9.6683335 9.6683335 ZT20-23 10.460806999999999 10.460806999999999 10.460806999999999