condition mean min max ZT0-3 0.7970410000000001 0.7970410000000001 0.7970410000000001 ZT4-7 0.541228 0.541228 0.541228 ZT8-11 0.781815 0.781815 0.781815 ZT12-15 1.1436250000000001 1.1436250000000001 1.1436250000000001 ZT16-19 1.5277949999999998 1.5277949999999998 1.5277949999999998 ZT20-23 0.7046479999999999 0.7046479999999999 0.7046479999999999