condition mean min max ZT0-3 6.2217649999999995 6.2217649999999995 6.2217649999999995 ZT4-7 5.041214999999999 5.041214999999999 5.041214999999999 ZT8-11 4.474425 4.474425 4.474425 ZT12-15 4.414985 4.414985 4.414985 ZT16-19 5.80634 5.80634 5.80634 ZT20-23 5.2394 5.2394 5.2394