It is important to note that estimates by quarter are not as robust as our estimates for rolling years and are not official statistics. This is due to the small sample sizes involved and because the complete methodology applied to our estimates for full years cannot be applied to our estimates for individual quarters.
Due to the seasonal nature of international migration and the small sample sizes involved for individual quarter data, users should be cautious with any interpretation of individual quarter estimates, especially where the corresponding confidence interval is large in comparison with the estimate.
Where these data are used we advise users to only compare the individual quarter data with the same quarter in the previous years. However, given the limitations with quality, methodology and coverage we recommend using the estimates for rolling years over the individual quarter data.