condition mean min max ZT0-3 10.31513 8.66851 11.961749999999999 ZT4-7 6.4657 6.4657 6.4657 ZT8-11 7.4990000000000006 7.4990000000000006 7.4990000000000006 ZT12-15 0 0 0 ZT16-19 10.196245 10.196245 10.196245 ZT20-23 9.185475 9.185475 9.185475