condition mean min max ZT0-3 0.741656 0.641084 0.842228 ZT4-7 5.127855 5.127855 5.127855 ZT8-11 10.652519999999999 10.652519999999999 10.652519999999999 ZT12-15 0 0 0 ZT16-19 2.884815 2.884815 2.884815 ZT20-23 2.6861800000000002 2.6861800000000002 2.6861800000000002