condition mean min max ZT0-3 2.76505 2.35339 3.524365 ZT4-7 2.73181 2.73181 2.73181 ZT8-11 3.09985 3.09985 3.09985 ZT12-15 5.95185 5.3621 6.5416 ZT16-19 3.403955 3.403955 3.403955 ZT20-23 3.73965 3.73965 3.73965