table_7.6 {contingencytables}R Documentation

Low Birth Weight vs psychiatric morbitidy with control as reference category


Categories of birth weight and psychiatric problems at age 20 years (Lund et al., 2012).

Lund et al. (2012) report psychiatric morbidity in young adulthood in two low birth weight groups and a control group. The subjects were born between 1986 and 1988. The very low birth weight (VLBW) group consisted of babies born preterm with birth weight up to 1500 grams. The small for gestational age at term (SGA) group was born at term with birth weight below the 10th percentile adjusted for gestational age, sex, and parity. The control group was born at term, and was not small for gestational age. Table 7.6 shows the severity level of psychiatric problems at age 20 years. We shall regard the birth groups as unordered; however, the diagnostic groups are naturally ordered. Hence, Table 7.6 is a singly ordered 3 × 3 table with unordered rows and ordered columns.




An object of class matrix (inherits from array) with 3 rows and 3 columns.


Fagerland MW, Lydersen S, Laake P (2017)

Lund et al. (2012)

[Package contingencytables version 2.2.0 Index]