condition mean min max ZT0-3 12.212346 12.212346 12.212346 ZT4-7 10.507534 10.507534 10.507534 ZT8-11 9.529569500000001 9.529569500000001 9.529569500000001 ZT12-15 10.1934965 10.1934965 10.1934965 ZT16-19 10.124311 10.124311 10.124311 ZT20-23 11.879011 11.879011 11.879011