condition mean min max ZT0-3 7.048683333333333 1.8618299999999999 10.43695 ZT4-7 1.304165 1.304165 1.304165 ZT8-11 4.03944 4.03944 4.03944 ZT12-15 10.521360000000001 8.823170000000001 12.21955 ZT16-19 10.697299999999998 10.697299999999998 10.697299999999998 ZT20-23 12.59465 12.59465 12.59465