condition mean min max ZT0-3 11.878545 11.878545 11.878545 ZT4-7 10.19866 10.19866 10.19866 ZT8-11 9.6778795 9.6778795 9.6778795 ZT12-15 9.262684 9.262684 9.262684 ZT16-19 9.8130445 9.8130445 9.8130445 ZT20-23 10.695881 10.695881 10.695881