condition mean min max ZT0-3 4.8706675 4.601565 5.13977 ZT4-7 3.9146799999999997 3.9146799999999997 3.9146799999999997 ZT8-11 4.29052 4.29052 4.29052 ZT12-15 0 0 0 ZT16-19 7.0785800000000005 7.0785800000000005 7.0785800000000005 ZT20-23 5.342175 5.342175 5.342175