condition mean min max ZT0-3 561.67211 561.67211 561.67211 ZT4-7 526.96966 526.96966 526.96966 ZT8-11 483.772827 483.772827 483.772827 ZT12-15 499.8992955 499.8992955 499.8992955 ZT16-19 497.054837 497.054837 497.054837 ZT20-23 304.335629 304.335629 304.335629