condition mean min max ZT0-3 11.398643 11.398643 11.398643 ZT4-7 10.596350999999999 10.596350999999999 10.596350999999999 ZT8-11 11.327019 11.327019 11.327019 ZT12-15 10.8076165 10.8076165 10.8076165 ZT16-19 10.5826815 10.5826815 10.5826815 ZT20-23 12.2444125 12.2444125 12.2444125