condition mean min max ZT0-3 0.45355616666666665 0.35035499999999997 0.540372 ZT4-7 0.6750605 0.6750605 0.6750605 ZT8-11 0.620756 0.620756 0.620756 ZT12-15 1.5805574999999998 1.352715 1.8084 ZT16-19 1.3744095 1.3744095 1.3744095 ZT20-23 1.205375 1.205375 1.205375