condition mean min max ZT0-3 5.41376 4.635104999999999 6.30603 ZT4-7 3.55605 3.55605 3.55605 ZT8-11 2.964035 2.964035 2.964035 ZT12-15 5.1624725 4.848034999999999 5.47691 ZT16-19 3.9673749999999997 3.9673749999999997 3.9673749999999997 ZT20-23 6.1322399999999995 6.1322399999999995 6.1322399999999995