condition mean min max ZT0-3 14.14095 12.583400000000001 15.6985 ZT4-7 9.8466 9.8466 9.8466 ZT8-11 5.13666 5.13666 5.13666 ZT12-15 0 0 0 ZT16-19 8.995855 8.995855 8.995855 ZT20-23 6.62763 6.62763 6.62763