condition mean min max ZT0-3 7.40821 7.286885 7.529535 ZT4-7 7.06473 7.06473 7.06473 ZT8-11 4.52195 4.52195 4.52195 ZT12-15 0 0 0 ZT16-19 4.647360000000001 4.647360000000001 4.647360000000001 ZT20-23 11.53895 11.53895 11.53895