I'm an academic editor in the field of medicine and I often come across complex comparisons. My question is specifically regarding how the placement of the verb affects the the parallelism of the comparison.
Please check the following three sentences:
Median serum thyroxine was significantly decreased in patients with a suppressed TSH compared to those with a normal TSH.
Median serum thyroxine was significantly decreased in patients with a suppressed TSH compared to that in patients with a normal TSH.
Median serum thyroxine in patients with a suppressed TSH was significantly decreased compared to that in patients with a normal TSH.
To the best of my knowledge, sentences 1 and 3 are accurate in terms of parallelism. However, a couple of my friends agree that 1 is wrong and 2 is right. We all agree on 3 being the best form.
I would like to know your opinion regarding the same. In particular, if someone can link me to any resources regarding the changes that need to be made according to the placement of the verb for maintaining parallelism in such comparisons, it would be great.