condition mean min max ZT0-3 0.2519595 0.2519595 0.2519595 ZT4-7 0.149261 0.149261 0.149261 ZT8-11 0.39181849999999996 0.39181849999999996 0.39181849999999996 ZT12-15 0.530181 0.530181 0.530181 ZT16-19 0.43452349999999995 0.43452349999999995 0.43452349999999995 ZT20-23 0.4745055 0.4745055 0.4745055