condition mean min max ZT0-3 25.471089329999998 21.65549538 29.28668328 ZT4-7 41.0595498375 37.089168425 45.029931250000004 ZT8-11 31.07997201 29.522314445 32.637629575 ZT12-15 16.2672214625 15.125677275000001 17.40876565 ZT16-19 19.417109347500002 18.69398632 20.140232375 ZT20-23 24.316908832499998 23.602971415 25.03084625