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Table 1 Characteristics of study participants by household, stratified by study wave

From: Longitudinal social contacts among school-aged children during the COVID-19 pandemic: the Bay Area Contacts among Kids (BACK) study

  Total
(N = 1967 households)
Wave 1
(N = 612 households)
Wave 2
(N = 716 households)
Wave 3
(N = 639 households)
Number of household members
 Mean (SD) 3.77 (1.07) 3.71 (0.979) 3.82 (1.08) 3.77 (1.13)
 Median [Min, Max] 4.00 [2. 7] 4.00 [2.00, 6.00] 4.00 [2.00, 6.00] 4 [2. 7]
  N (%) N (%) N (%) N (%)
County
 Alameda 529 (26.9) 218 (35.6) 167 (23.3) 144 (22.5)
 Contra Costa 298 (15.1) 121 (19.8) 81 (11.3) 96 (15.0)
 Marin 22 (1.1) 4 (0.7) 11 (1.5) 7 (1.1)
 Napa 14 (0.7) 5 (0.8) 3 (0.4) 6 (0.9)
 San Francisco 388 (19.7) 69 (11.3) 146 (20.4) 173 (27.1)
 San Mateo 153 (7.8) 42 (6.9) 69 (9.6) 42 (6.6)
 Santa Clara 411 (20.9) 108 (17.6) 173 (27.1) 130 (20.3)
 Solano 68 (3.5) 22 (3.6) 32 (4.5) 14 (2.2)
 Sonoma 84 (4.3) 23 (3.8) 34 (4.7) 27 (4.2)
Race
 White Alone 1098 (55.8) 341 (55.7) 413 (57.7) 344 (53.8)
 Black or African American Alone 147 (7.5) 56 (9.2) 45 (6.3) 46 (7.2)
 Asian alone 510 (25.9) 159 (26.0) 171 (23.9) 180 (28.2)
 American Indian or Alaskan Native 13 (0.7) 4 (0.7) 3 (0.4) 6 (0.9)
 Native Hawaiian or Pacific Islander alone 5 (0.3) 2 (0.3) 2 (0.3) 1 (0.2)
 Some other race alone 103 (5.2) 23 (3.8) 44 (6.1) 36 (5.6)
 Two or more races 91 (4.6) 27 (4.4) 38 (5.3) 26 (4.1)
Hispanic
 Non-Hispanic household 1578 (80.2) 496 (81.0) 582 (81.3) 500 (78.2)
 Hispanic household 389 (19.8) 116 (19.0) 134 (18.7) 139 (21.8)
Household income
 Less than $19,999 110 (5.6) 34 (5.6) 40 (5.6) 36 (5.6)
 $20,000 to $39,999 158 (8.0) 51 (8.3) 54 (7.5) 53 (8.3)
 $40,000 to $59,999 188 (9.6) 53 (8.7) 71 (9.9) 64 (10.0)
 $60,000 to $79,999 205 (10.4) 61 (10.0) 75 (10.5) 69 (10.8)
 $80,000 to $99,999 205 (10.4) 58 (9.5) 72 (10.1) 75 (11.7)
 $100,000 to $149,999 394 (20.0) 107 (17.5) 140 (19.6) 147 (23.0)
 $150,000 or more 707 (35.9) 248 (40.5) 264 (36.9) 195 (30.5)
Multi-parent household
 Yes 1772 (90.1) 555 (90.7) 655 (91.5) 562 (87.9)
 No 195 (9.9) 57 (9.3) 61 (88.5) 77 (12.1)
Weekday of reported contacts
 Weekday 1611 (81.9) 510 (83.3) 615 (85.9) 486 (76.1)
 Weekend 356 (18.1) 102 (16.7) 101 (14.1) 153 (23.9)
Work from home1
 Adults work from home 1039 (54.9) 437 (74.2) 329 (48.0) 273 (44.3)
 Adults do not work from home 852 (45.1) 152 (25.8) 357 (52.1) 343 (55.7)
  1. Wave 1 corresponds to data collected between May 4–June 1 2020; Wave 2 was collected August 20–October 1 2020; Wave 3 was collected February 8– April 7, 2021
  2. 1Due to occasional missing values in this variable across each wave of data collection, the numbers do not sum to the total number of surveyed households across each wave. Percentages are calculated out of all households who completed this question in each survey