condition mean min max ZT0-3 11.328633333333332 10.42845 12.70345 ZT4-7 9.113209999999999 9.113209999999999 9.113209999999999 ZT8-11 7.68178 7.68178 7.68178 ZT12-15 10.9821525 10.702205 11.2621 ZT16-19 8.68082 8.68082 8.68082 ZT20-23 13.4624 13.4624 13.4624