condition mean min max ZT0-3 11.82345 11.82345 11.82345 ZT4-7 9.372585 9.372585 9.372585 ZT8-11 10.76435 10.76435 10.76435 ZT12-15 12.845749999999999 12.845749999999999 12.845749999999999 ZT16-19 12.4006 12.4006 12.4006 ZT20-23 10.90775 10.90775 10.90775