condition mean min max ZT0-3 0.615657 0.615657 0.615657 ZT4-7 0.44427799999999995 0.44427799999999995 0.44427799999999995 ZT8-11 2.8594600000000003 2.8594600000000003 2.8594600000000003 ZT12-15 5.617045 5.617045 5.617045 ZT16-19 5.18789 5.18789 5.18789 ZT20-23 1.72316 1.72316 1.72316