condition mean min max ZT0-3 8.958874999999999 8.958874999999999 8.958874999999999 ZT4-7 7.16737 7.16737 7.16737 ZT8-11 12.9097 12.9097 12.9097 ZT12-15 8.79547 8.79547 8.79547 ZT16-19 14.5352 14.5352 14.5352 ZT20-23 10.56411 10.56411 10.56411