condition mean min max ZT0-3 10.2137425 7.973135000000001 12.45435 ZT4-7 6.04269 6.04269 6.04269 ZT8-11 18.81745 18.81745 18.81745 ZT12-15 0 0 0 ZT16-19 29.915699999999998 29.915699999999998 29.915699999999998 ZT20-23 18.28875 18.28875 18.28875