Application of Seemingly Unrelated Regression in Medical Data with Intermittently Observed Time-Dependent Covariates

Table 1

Specification of all situations of intermittently observed time-dependent covariates to be imposed on IMI and DMI.

Situation	Covariate
	IMI				DMI
	Week
	0	1	2	3	0	1	2	3
1	O	O	O	O	O	O	U	O
2	O	O	U	O	O	O	O	O
3	O	O	O	O	O	U	O	O
4	O	U	O	O	O	O	O	O
5	O	O	O	O	O	U	U	O
6	O	U	U	O	O	O	O	O
7	O	U	O	O	O	U	O	O
8	O	O	U	O	O	O	U	O
9	O	U	U	O	O	U	U	O
10	O	O	U	O	O	U	O	O
11	O	U	O	O	O	O	U	O
12	O	U	U	O	O	U	O	O
13	O	U	U	O	O	O	U	O
14	O	U	O	O	O	U	U	O
15	O	O	U	O	O	U	U	O

*Note: “O” means that the covariate at that time point was “Observed”, and “U” means that it was “Unobserved” at that time point.