Sentence examples for seasons of surgery from inspiring English sources

The seasons of surgery, generally 1 3 weeks after the diagnosis, were defined as follows: winter (1 December to 28 or 29 February), spring (1 March to 31 May), summer (1 June to 31 August) and autumn (1 September to 30 November), so the summer period includes the months with the possibility of most sun exposure due to the altitude of the sun and vacations.

Breast cancer survival and season of surgery.

The frequency of allocated systemic treatment (chemotherapy and endocrine therapy) by season of surgery was reported.

The association between OS and season of surgery was analysed by Cox proportional hazards regression models.

Using this approach, the independent prognostic effect of season of surgery seems to disappear.

2, 5 and 10 years after surgery, the association between OS and season of surgery was not significant.

The HRs of season of surgery (winter as reference level) together with their 95% CIs are reported.

The association between OS and season of surgery was analysed by Cox proportional hazards regression models, at survival periods 0 1, 0 2, 0 5 and 0 10 years after surgery.

Only after adjustment for prognostic factors that may be influenced by vitamin D, 1-year survival was close to significantly associated season of surgery.

The basic characteristics of the patient material according to season of surgery are presented in table 1. HRs of OS up to 10 years with surgery performed in winter as reference are given in table 2. Overall, no statistically significant association between OS and season of surgery are observed in 2-, 5- and 10-year follow-up periods.

Thus, the estimates of association between OS and seasonal of surgery are not affected by the variables potentially associated with vitamin D or season of surgery (tumour size, positive axillary nodes, high-grade tumours and oestrogen receptor/progesterone receptor status).