Table 2.

Distribution of number of contacts reported by participants. This shows the median and interquartile range (IQR) of contacts reported by participants across four rounds of data collection in five US companies, April 2020 – December 2021. NH refers to non-Hispanic ethnicity.

Variable	Total* (N (%))	Round 1Apr – Jun ‘20	Round 2Nov ‘20 – Jan ‘21	Round 3Jun – Aug ‘21	Round 4Nov `21 – Dec ‘21
Overall	12,198	2 (1–4)	7 (4–10)	7 (4–12)	8 (4–13)
Sex
Female	7755 (64)	2 (1–4)	6 (4–10)	7 (4–12)	8 (4–13)
Male	4423 (36)	3 (1–4)	7 (4–10)	7 (4–13)	7 (4–13)
Not reported	20 (0)	1 (0–1	8 (8–8)	NA	NA
Age Group
20–29	3481 (29)	2 (1–3)	6 (3–9)	8 (4–12)	7 (3–12)
30–39	3198 (26)	2 (1–4)	6 (4–9)	6 (4–10)	7 (4–12)
40–49	3001 (25)	3 (2–5)	9 (5–12)	9 (4–14)	9 (4–14)
50–59	1875 (15)	2 (1–4)	6 (4–9)	10 (5–14)	7 (4–15)
60 +	643 (5)	2 (1–4)	8 (4–12)	7 (4–10)	10 (6–16)
Family structure
Live alone	1597 (14)	1 (0–3)	6 (3–9)	6 (3–10)	9 (4–14)
Nuclear	7865 (63)	2 (1–4)	7 (4–11)	7 (4–12)	7 (4–13)
Extended	1263 (11)	3 (2–5)	8 (6–9)	10 (6–13)	8 (4–12)
With roommates	1259 (11)	3 (1–4)	6 (4–9)	9 (5–14)	6 (3–13)
Other	214 (2)	2 (1–4)	10 (4–19)	5 (3–9)	7 (6–8)
Setting of contact Community	6036 (50)	2 (1–4)	4 (2–7)	5 (2–9)	5 (2–9)
Home	4515 (37)	3 (2–6)	4 (2–6)	3 (2–5)	3 (2–5)
Work	1647 (13)	1 (1–10)	6 (3–9)	4 (2–8)	6 (4–10)
Race/Hispanic
Hispanic	898 (7)	3 (1–4)	6 (4–11)	7 (5–11)	10 (6–19)
Asian, NH	2400 (20)	2 (1–3)	8 (3–9)	7 (3–11)	7 (3–13)
Black, NH	1187 (9)	2 (1–4)	7 (5–10)	8 (5–11)	6 (3–12)
White, NH	7024 (60)	3 (1–4)	7 (4–10)	8 (4–13)	7 (4–12)
Mixed, NH	440 (5)	2 (1–4)	4 (3–9)	6 (3–10)	0
Other, NH	249 (4)	3 (1–4)	4 (3–5)	5 (3–9)	8 (5–13)

^*Each stratification refers to the number of contacts reported by the participant per strata. The values in the table refer to the two study days combined.