Table 1. Number of participants who were eligible and who responded to the first COVID-19 questionnaire.

Cohort Group	Eligible 1	Responded 2
G0 Mothers	4590	2706 (59%)
G0 Fathers/partners	1803	1014 (56%)
G1 Offspring daughters	3617	2126 (59%)
G1 Offspring sons	2225	847 (38%)
G1 Offspring partners (female)	103	63 (61%)
G1 Offspring partners (male)	182	51 (28%)
TOTAL	12520	6807 (54%)

¹valid email address, marked as contactable for questionnaires

²Proportions of those invited (i.e. eligible)