condition mean min max ZT0-3 3.67399 2.901375 4.446605 ZT4-7 3.46199 3.46199 3.46199 ZT8-11 12.269950000000001 12.269950000000001 12.269950000000001 ZT12-15 0 0 0 ZT16-19 11.6349 11.6349 11.6349 ZT20-23 9.899435 9.899435 9.899435