condition mean min max ZT0-3 11.284499 11.284499 11.284499 ZT4-7 10.3924185 10.3924185 10.3924185 ZT8-11 11.265235 11.265235 11.265235 ZT12-15 9.539095 9.539095 9.539095 ZT16-19 10.4793385 10.4793385 10.4793385 ZT20-23 10.4217665 10.4217665 10.4217665