Table 6 Group sizes
From: Challenges in the design, planning and implementation of trials evaluating group interventions
| Â | Ideal group size | Mean number of participants per group (SD) a | Median number of participants per group (IQR) a | Minimum and maximum group size a | Number of sessions delivered with correct group size (% of number of sessions delivered a) | Number of sessions with 0 or 1 person recorded (% of planned sessions) |
|---|---|---|---|---|---|---|
LM [2] | 8–16 | 7.7 (2.42) | 7 (6–9) | 2–15 | 80/173 (46.2%) | 13/186 (6.9%) |
PLINY [3] | 6–8 | 5.1 (1.17) | 6 (4–6) | 3–6 | 24/41 (58.5%) | 1/42 (2.4%) |
REPOSE [4] | 5–8 | 5.8 (1.38) | 6 (5–7) | 3–8 | 36/46 (78.3%) | 0/46 (0%) |
STEPWISE [5] | 6–8 | Foundation: 4.2 (1.69) | 4 (3–5) | 2–9 | 25/129 (18.9%) | 3/132 (2.3%) |
Booster: 3.5 (1.41) | 3 (2–4) | 2–8 | 7/75 (7.1%) | 23/98 (23.5%) | ||
JtD [1] | 8–12 | 5.3 (1.71) | 6 (4–6) | 2–9 | 32/331 (9.7%) | 5/336 (1.5%) |