condition mean min max ZT0-3 11.649999999999999 11.649999999999999 11.649999999999999 ZT4-7 4.8 4.8 4.8 ZT8-11 38.1 38.1 38.1 ZT12-15 29.049999999999997 29.049999999999997 29.049999999999997 ZT16-19 7.65 7.65 7.65 ZT20-23 16.55 16.55 16.55