condition mean min max ZT0-3 6.67127 6.67127 6.67127 ZT4-7 6.561745 6.561745 6.561745 ZT8-11 5.334645 5.334645 5.334645 ZT12-15 5.958845 5.958845 5.958845 ZT16-19 7.290315 7.290315 7.290315 ZT20-23 5.772360000000001 5.772360000000001 5.772360000000001