Table 4 Intervention fidelity and acceptability of the SPRING intervention

Fidelity (n = 33)

Component

Delivery

Receipt

Enactment

Intervention lessons (6 lessons)

Completed^a: 88% (79–94%)

Duration^a: 39.9 ± 6.6 min

n/a

Intervention check-ins (7 contacts)

Completed^a: 83% (68–94%)

Duration^a: 13.7 ± 4.7 min

n/a

Height adjustable^b workstation

Provided: 100%

Working^a: 100% (97–100%)

Self-monitoring standing^a: 65% (17–83%)

Self-reported standing^a: 2.3 ± 1.3 h/day

Activity monitor^b

Provided: 100%

Working^a: 98 (90–100%)

Wearing regularly^a: 97% (90–100%)

Self-monitoring movement breaks and steps^a: 97% (92–100%)

Objective movement breaks^a: 7.8 ± 3.7 breaks/day

Objective steps^a: 6521 ± 2571 steps/day

Facebook group

Interventionist sent request: 94%

Participant accepted request: 81%

Reported visiting at least weekly: 17%

Acceptability (n = 24)

Usefulness of components

Range: 0 (not at all) to 3 (very much)

Activity monitor: 2.6 ± 0.6

Height adjustable workstation: 2.5 ± 0.8

Intervention check-ins: 1.9 ± 0.6

Intervention lessons: 1.8 ± 0.6

Facebook group: 0.6 ± 0.6

Lesson ratings

Range: 0 (not helpful) to 2 (very helpful)

Lesson 1 Education: 1.8 ± 0.4

Lesson 2 Social support: 1.0 ± 0.7

Lesson 3 Get to know your cues: 1.6 ± 0.5

Lesson 4 Progress report: 1.5 ± 0.5

Lesson 5 Motivation: 1.5 ± 0.6

Lesson 6 Lapses don’t have to be collapses: 1.5 ± 0.5

General ratings

Agree or strongly agree, unless otherwise noted

Intervention had a positive effect on my pregnancy: 96%

Increased understanding of the health risks of sitting during pregnancy: 79%

Expectations were met: 88%

Intervention asked too much of my time: 13%

Format preference: 58% (no change), 13% (no group meeting), 38% (more group meetings)

Will continue changes made during the intervention: 46% (probably will) and 54% (definitely will)