condition mean min max ZT0-3 4.55636 4.288995 4.823725 ZT4-7 6.838165 6.838165 6.838165 ZT8-11 11.7889 11.7889 11.7889 ZT12-15 0 0 0 ZT16-19 8.778125 8.778125 8.778125 ZT20-23 7.653560000000001 7.653560000000001 7.653560000000001