condition mean min max ZT0-3 368.462826 368.462826 368.462826 ZT4-7 246.96563650000002 246.96563650000002 246.96563650000002 ZT8-11 224.9300035 224.9300035 224.9300035 ZT12-15 307.8103465 307.8103465 307.8103465 ZT16-19 489.354883 489.354883 489.354883 ZT20-23 651.2410935 651.2410935 651.2410935