Code
tbl1 %>% as.data.frame()
Output
**Characteristic** **Beta** **95% CI** **p-value**
1 Marker Level (ng/mL) -0.04 -2.6, 2.5 >0.9
2 Grade <NA> <NA> <NA>
3 I <NA> <NA> <NA>
4 II 0.64 -4.7, 6.0 0.814
5 III 2.4 -2.8, 7.6 0.366
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