condition mean min max ZT0-3 3.2994825 2.424875 4.17409 ZT4-7 5.716395 5.716395 5.716395 ZT8-11 5.76229 5.76229 5.76229 ZT12-15 0 0 0 ZT16-19 6.811695 6.811695 6.811695 ZT20-23 5.35261 5.35261 5.35261