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Table 1 The seven batches for which GPs were invited in 14 months

From: SMS text messaging to measure working time: the design of a time use study among general practitioners

  Recruitment participants in period Start SMS weeks in period Weeks of the year/SMS weeks Number of invitations
Batch 1 October – December ‘12 December ‘12 - January ‘13 49 to 52 and 01 to 04 555
Batch 2 November ‘12-January ‘13 January–February ‘13 01 to 09 537
Batch 3 January – March ‘13 March–April ‘13 10 to 18 781
Batch 4 March – May ‘13 May–June ‘13 19 to 26 795
Batch 5 May – July ‘13 July–August ‘13 27 to 35 794
Batch 6 July – September ‘13 September–October ‘13 36 to 44 728
Batch 7 September – December ‘13 November ‘13 - January ‘14 45 to 01 838