condition mean min max ZT0-3 0.987228 0.378181 1.596275 ZT4-7 1.7013085 1.7013085 1.7013085 ZT8-11 2.86822 2.86822 2.86822 ZT12-15 0 0 0 ZT16-19 2.0576165 2.0576165 2.0576165 ZT20-23 2.1540600000000003 2.1540600000000003 2.1540600000000003