"there were major differences in" is correct and usable in written English.
It is typically used to express that there were significant variations or discrepancies in something. Example: "In the study, there were major differences in the responses of participants from different age groups."
"Before Iraq, I don't think there were major differences in terms of policy responses".
There were major differences in that bill and the one that passed this year.
There were major differences in the investigative approach, with the Justice prosecutors seeking to build the investigation methodically, "from the ground up," and the F.B.I. agents trying "to pursue several investigative tracks simultaneously".
In addition, there were major differences in the problem-solving behaviors of the two groups.
There were major differences in C stock estimates produced using GIS interpolation, average C contained in all marsh cores, or cores along a single transect.
Although there were major differences in the volatile constituents identified, this was not surprising due to the very different experimental conditions of this study.
Most notably in the 15 24 year olds there were major difference in the distribution of diagnoses between males and females.
The experimental results demonstrate that already in an early stage of deposition there are major differences in the developing textures.
This finding suggests that there are major differences in the genome structures of different accessions, which are all classed as S. lycopersicum var.
Our results suggest that there are major differences in the duration of ICU visits in different world regions.
There are major differences in the cytoplasmic domains of Sn of different species, both in amino acid sequence and length.
