Table 3.

Sample size, number of predictor variables, and number of children with septic arthritis and transient synovitis

Study	Sample size	No variables	No episodes of septic arthritis	No episodes of transient synovitis	Minimum number of septic arthritis cases required
Kocher et al., 1999 [6]	168	4	82	86	40
Kocher et al., 2004 [5]	154	4	51	103	40
Luhmann et al., 2004 [8]	165	4	47	118	40
Caird et al., 2006 [3]	48	5	34	14	50
Sultan and Hughes 2010 [12]	96	5	5	91	50
Singhal et al., 2011 [11]	311	5	29	182	50

This table then goes on to determine the number of events required to support logistic regression.