condition mean min max ZT0-3 8.588425 8.588425 8.588425 ZT4-7 6.64081 6.64081 6.64081 ZT8-11 5.573729999999999 5.573729999999999 5.573729999999999 ZT12-15 4.939375 4.939375 4.939375 ZT16-19 5.81822 5.81822 5.81822 ZT20-23 9.341529999999999 9.341529999999999 9.341529999999999