condition mean min max ZT0-3 9.773444999999999 9.773444999999999 9.773444999999999 ZT4-7 7.42001 7.42001 7.42001 ZT8-11 6.59067 6.59067 6.59067 ZT12-15 8.873584999999999 8.873584999999999 8.873584999999999 ZT16-19 11.70965 11.70965 11.70965 ZT20-23 10.64721 10.64721 10.64721