condition mean min max ZT0-3 0.6675948884999999 0.188747603 1.146442174 ZT4-7 0.5326188052499999 0.5192368709999999 0.5460007394999999 ZT8-11 0.22905313825 0.117044022 0.3410622545 ZT12-15 0.31328786125 0.17236315800000002 0.4542125645 ZT16-19 1.14318344475 0.9443608324999999 1.3420060569999999 ZT20-23 2.31712183925 2.0239250715 2.610318607