condition mean min max ZT0-3 2.7494050000000003 2.7494050000000003 2.7494050000000003 ZT4-7 1.7941099999999999 1.7941099999999999 1.7941099999999999 ZT8-11 2.768145 2.768145 2.768145 ZT12-15 3.84237 3.84237 3.84237 ZT16-19 5.059865 5.059865 5.059865 ZT20-23 3.0110349999999997 3.0110349999999997 3.0110349999999997