condition mean min max ZT0-3 12.7437 12.7437 12.7437 ZT4-7 7.922454999999999 7.922454999999999 7.922454999999999 ZT8-11 16.2658 16.2658 16.2658 ZT12-15 15.566400000000002 15.566400000000002 15.566400000000002 ZT16-19 11.0989 11.0989 11.0989 ZT20-23 9.268740000000001 9.268740000000001 9.268740000000001