condition mean min max ZT0-3 5.5038525 5.13142 5.876284999999999 ZT4-7 5.61228 5.61228 5.61228 ZT8-11 5.355605000000001 5.355605000000001 5.355605000000001 ZT12-15 0 0 0 ZT16-19 5.428465 5.428465 5.428465 ZT20-23 5.7173 5.7173 5.7173