condition mean min max ZT0-3 40.302425 39.151849999999996 41.453 ZT4-7 24.85085 24.85085 24.85085 ZT8-11 27.665799999999997 27.665799999999997 27.665799999999997 ZT12-15 0 0 0 ZT16-19 38.8399 38.8399 38.8399 ZT20-23 36.2791 36.2791 36.2791