condition mean min max ZT0-3 4.27638 2.92033 6.27956 ZT4-7 9.570005 9.570005 9.570005 ZT8-11 4.13561 4.13561 4.13561 ZT12-15 5.67811 5.2989049999999995 6.057315 ZT16-19 4.559035 4.559035 4.559035 ZT20-23 3.754055 3.754055 3.754055