condition mean min max ZT0-3 16.65975 15.3513 17.9682 ZT4-7 9.553645 9.553645 9.553645 ZT8-11 9.1222 9.1222 9.1222 ZT12-15 0 0 0 ZT16-19 5.781815 5.781815 5.781815 ZT20-23 9.394375 9.394375 9.394375