condition mean min max ZT0-3 8.885955000000001 7.894455 9.877455000000001 ZT4-7 8.781414999999999 8.781414999999999 8.781414999999999 ZT8-11 8.924335 8.924335 8.924335 ZT12-15 0 0 0 ZT16-19 12.139700000000001 12.139700000000001 12.139700000000001 ZT20-23 9.632275 9.632275 9.632275