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Table 1 Study characteristics

From: Clustering of continuous and binary outcomes at the general practice level in individually randomised studies in primary care - a review of 10 years of primary care trials

Study IDStudy topicNumber of practicesNumber of participantsMean cluster sizeNumber of measures available
1GRACE trial – antibiotics for lower respiratory tract infection [15]672061313
2Internet Doctor – self management of respiratory tract infections [16]343044906
3Internet based vestibular rehabilitation for dizziness [17]5529654
4PIPS – ibuprofen, paracetamol and steam for respiratory tract infections [18]25889365
5POWER plus – management of obesity [19]56818156
6PRIMIT – handwashing to modify respiratory tract infection transmission [20]34420,066584
7SNIFS – Steam inhalation & nasal irrigation for sinus symptoms [21]72961135
8TASTE – Probiotics and chewing gum for sore throat [22]821009112
9AIRS – Autoinflation for children with otitis media [23]3932082
10GNOME – Topical intranasal corticosteroids in children with otitis media [24]7621732
11ATEAM – Alexander technique, exercise, massage for chronic back pain [25]6457996
12ASCOT – Antibiotics and topical nasal steroid for sinusitis [26]5824042
13Antibiotic prescribing for conjunctivitis [27]30307102
14Leaflet and antibiotic prescribing for lower respiratory tract infection [28]37807222
15PIPO – probiotics for prevention of otitis media in childrena13267212
16THREAD – SSRI for depression [29]11522023
17MIBS – management of irritable bowel syndrome [30]2613555
  1. aUnpublished, private correspondence