condition mean min max ZT0-3 14.577886 14.577886 14.577886 ZT4-7 12.1890935 12.1890935 12.1890935 ZT8-11 10.636242 10.636242 10.636242 ZT12-15 12.104585 12.104585 12.104585 ZT16-19 10.530151 10.530151 10.530151 ZT20-23 10.913278 10.913278 10.913278