Table 3.

Estimation of COVID-19 mortality rate per 1000 person-week among indigenous and non-indigenous groups across four pandemic waves and by year in Mexico.

Wave	Deaths indigenous	Deaths non-indigenous	Person-weeks indigenous	Person-weeks non-indigenous	Mortality rate per 1000 person-weeks indigenous (R1)	Mortality rate per 1000 person-weeks non-indigenous (R2)	Rate ratio (R1/R2)
First wave 19 Feb 2020 – 3 Oct 2020	1679	83,002	99,912.42	7,693,327	16.71	10.79	1.55
Second wave 4 Oct 2020 – 29 May 2021	985	95,517	107,946.1	17,323,003	9.12	5.51	1.65
Third wave 30 May 2021 – 18 Dec 2021 (First case of Delta variant reported in 15 July 2021)	926	38,627	68,398.43	5,309,029	13.54	7.27	1.86
Fourth wave 19 Dec 2021 – 25 March 2022 (First case of Omicron variant reported on 3 Dec 2021)	141	9666	10,932.43	1,800,412	12.90	5.37	2.40
2020 (19 Feb 2020 – 31 Dec 2021)	2055	127,131	902,822.9	93,530,292.14	2.28	1.36	1.67
2021 (1 Jan 2021 – 31 Dec 2021)	1533	85,195	262,511.9	25,549,998.29	5.84	3.33	1.75
Overall (19 Feb 2020 – 25 March 2022)	3818	233,750	1,175,598	120,703,675.1	3.25	1.94	1.68

Note: The overall person-time was calculated as the difference between the date of symptom onset and death for events (death). For non-death cases (censored) the person-time was calculated as the difference between date of symptom onset and cutoff date of 25 March 2021. For wave-wise estimation, person-time was calculated for the interval period only. Person-week was calculated by dividing total person-days by 7.