condition mean min max ZT0-3 10.2118775 9.225605 11.19815 ZT4-7 7.64428 7.64428 7.64428 ZT8-11 6.79106 6.79106 6.79106 ZT12-15 0 0 0 ZT16-19 9.906925000000001 9.906925000000001 9.906925000000001 ZT20-23 8.070775 8.070775 8.070775