condition mean min max ZT0-3 0.4742036666666667 0.3827165 0.5262725 ZT4-7 0.48035700000000003 0.48035700000000003 0.48035700000000003 ZT8-11 0.376958 0.376958 0.376958 ZT12-15 0.36403575 0.305085 0.4229865 ZT16-19 0.24665900000000002 0.24665900000000002 0.24665900000000002 ZT20-23 0.5011295 0.5011295 0.5011295