condition mean min max ZT0-3 6.60784 6.60784 6.60784 ZT4-7 6.045395 6.045395 6.045395 ZT8-11 6.627409999999999 6.627409999999999 6.627409999999999 ZT12-15 6.79749 6.79749 6.79749 ZT16-19 9.243134999999999 9.243134999999999 9.243134999999999 ZT20-23 6.727795 6.727795 6.727795