condition mean min max ZT0-3 2.57527 1.79108 3.26707 ZT4-7 2.863095 2.863095 2.863095 ZT8-11 1.91182 1.91182 1.91182 ZT12-15 3.0850099999999996 2.88252 3.2874999999999996 ZT16-19 2.538045 2.538045 2.538045 ZT20-23 3.6812499999999995 3.6812499999999995 3.6812499999999995