condition mean min max ZT0-3 2.23296093625 1.343373999 3.1225478735000003 ZT4-7 3.77374692725 3.2090540525 4.338439802 ZT8-11 3.75527189575 3.7071904505 3.803353341 ZT12-15 2.8478293407499997 2.809704938 2.8859537435 ZT16-19 3.1968100425 2.4544734685 3.9391466165000004 ZT20-23 5.425770742499999 5.0610495879999995 5.790491897