Table 3. Heterogeneity of difference between office hour appointments with and without the option to change to OOH in the invitation letter.

Category	Trial arm office hours	Invited	Attended	% Attended
Screening unit
Static	Standard	9004	6587	73.2%
	With option to OOH	3383	2584	76.4%
Mobile	Standard	406	313	77.1%
	With option to OOH	136	94	69.1%
Season
Spring	Standard	1438	1116	77.6%
	With option to OOH	992	746	75.2%
Summer	Standard	2211	1658	75.0%
	With option to OOH	570	459	80.5%
Autumn	Standard	2930	1947	66.5%
	With option to OOH	1235	915	74.1%
Winter	Standard	2831	2179	77.0%
	With option to OOH	722	558	77.3%
Attendance at previous screen
Attended	Standard	5700	5003	87.8%
	With option to OOH	2394	2112	88.2%
Not-attended	Standard	1933	591	30.6%
	With option to OOH	650	225	34.6%
Age group
47 to <54	Standard	2332	1713	73.5%
	With option to OOH	732	541	73.9%
54 to <59	Standard	2191	1621	74.0%
	With option to OOH	676	503	74.4%
59 to <65	Standard	2563	1889	73.7%
	With option to OOH	972	768	79.0%
65 to <74	Standard	2324	1677	72.2%
	With option to OOH	1139	866	76.0%

Abbreviation: OOH=out-of-hours.