condition mean min max ZT0-3 10.599875 10.45215 10.7476 ZT4-7 8.07299 8.07299 8.07299 ZT8-11 8.74927 8.74927 8.74927 ZT12-15 0 0 0 ZT16-19 10.9513 10.9513 10.9513 ZT20-23 10.293 10.293 10.293