condition mean min max ZT0-3 2.0207219312499998 1.9257982564999998 2.1156456059999997 ZT4-7 3.387760308 2.7525882535 4.0229323625 ZT8-11 8.0862958745 7.293114678499999 8.879477070499998 ZT12-15 9.69186757425 9.5405661655 9.843168983 ZT16-19 6.158153311 5.373645284 6.942661338000001 ZT20-23 10.46925195425 9.1271029135 11.811400995