condition mean min max ZT0-3 2.40533397025 1.31087061 3.4997973305 ZT4-7 4.88774308 4.5690502055 5.2064359545 ZT8-11 4.3595203985 4.2540018555 4.4650389415 ZT12-15 16.03934052375 13.107810777500001 18.97087027 ZT16-19 18.5011007225 18.304412915 18.697788529999997 ZT20-23 16.364316827499998 16.1203601 16.608273555