condition mean min max ZT0-3 0.16157636057683333 0.0812605 0.28769849999999997 ZT4-7 0.2028085 0.2028085 0.2028085 ZT8-11 0.3973715 0.3973715 0.3973715 ZT12-15 0.33220099999999997 0.18859599999999999 0.475806 ZT16-19 0.441484 0.441484 0.441484 ZT20-23 0.3193378 0.3193378 0.3193378