condition mean min max ZT0-3 437.55 437.55 437.55 ZT4-7 508.6 508.6 508.6 ZT8-11 487.40000000000003 487.40000000000003 487.40000000000003 ZT12-15 447.8 447.8 447.8 ZT16-19 471.15 471.15 471.15 ZT20-23 419.65 419.65 419.65