condition mean min max ZT0-3 8.751531666666667 6.8037849999999995 10.37523 ZT4-7 9.697455 9.697455 9.697455 ZT8-11 10.489935 10.489935 10.489935 ZT12-15 11.476395 10.173089999999998 12.7797 ZT16-19 8.698905 8.698905 8.698905 ZT20-23 14.0864 14.0864 14.0864