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Table 6 Group sizes

From: Challenges in the design, planning and implementation of trials evaluating group interventions

 Ideal group sizeMean number of participants per group (SD) aMedian number of participants per group (IQR) aMinimum and maximum group size aNumber 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]8–167.7 (2.42)7 (6–9)2–1580/173 (46.2%)13/186 (6.9%)
PLINY [3]6–85.1 (1.17)6 (4–6)3–624/41 (58.5%)1/42 (2.4%)
REPOSE [4]5–85.8 (1.38)6 (5–7)3–836/46 (78.3%)0/46 (0%)
STEPWISE [5]6–8Foundation: 4.2 (1.69)4 (3–5)2–925/129 (18.9%)3/132 (2.3%)
Booster: 3.5 (1.41)3 (2–4)2–87/75 (7.1%)23/98 (23.5%)
JtD [1]8–125.3 (1.71)6 (4–6)2–932/331 (9.7%)5/336 (1.5%)
  1. a Sessions recorded in the data with 0 or 1 individual attending have not been included here as this does not constitute a group session, number of sessions where 0 or 1 were recorded are provided in the final column