condition mean min max ZT0-3 7.687135 7.51876 7.85551 ZT4-7 9.132404999999999 9.132404999999999 9.132404999999999 ZT8-11 5.23889 5.23889 5.23889 ZT12-15 0 0 0 ZT16-19 7.68943 7.68943 7.68943 ZT20-23 8.21971 8.21971 8.21971