- G
a factor with levels
surfactant
placebo
- u.1
a numeric vector, u for time period 1.
- u.2
a numeric vector, u for time period 2.
- u.3
a numeric vector, u for time period 3.
- u.4
a numeric vector, u for time period 4.
- u.5
a numeric vector, u for time period 5.