condition mean min max ZT0-3 1.2907405 1.18242 1.399061 ZT4-7 1.910804 1.910804 1.910804 ZT8-11 1.5825600000000002 1.5825600000000002 1.5825600000000002 ZT12-15 0 0 0 ZT16-19 1.41906 1.41906 1.41906 ZT20-23 1.5101250000000002 1.5101250000000002 1.5101250000000002