condition mean min max ZT0-3 9.814538333333333 7.281409999999999 11.72465 ZT4-7 5.6068549999999995 5.6068549999999995 5.6068549999999995 ZT8-11 9.976469999999999 9.976469999999999 9.976469999999999 ZT12-15 10.1288075 9.237575 11.02004 ZT16-19 9.29559 9.29559 9.29559 ZT20-23 10.67875 10.67875 10.67875