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. 2014 Feb 6;8(1):11–22. doi: 10.1007/s11832-014-0558-3

Table 2.

Cosinor analyses of DDH births in Indiana

n Periodicity r 2 p value M A ϕ Month
All 424 7 0.70 0.005 33.61 11.45 122 Mar 13, Oct 12
VD 204 7 0.75 0.002 16.11 5.88 125 Mar 15, Oct 14
CS 183 7 0.69 0.005 14.38 5.86 117 Mar 10, Oct 9
Breech 125 8 0.57 0.023 9.92 3.19 44 Jan 30, Sep 30
Vertex 259 7 0.86 <0.001 20.23 9.00 132 Mar 19, Oct 18
Unilateral 281 7 0.71 0.004 22.36 7.05 118 Mar 11, Oct 10
Bilateral 140 8 0.43 0.079 10.74 4.30 100 Mar 9, Nov 7
Left 208 6 0.67 0.007 17.34 4.17 174 Mar 29, Sep 28
Right 72 7 0.54 0.032 5.61 2.72 110 Mar 6, Oct 5
Pavlik 260 7 0.61 0.014 20.39 8.46 132 Mar 19, Oct 18
Operative 126 10 0.56 0.025 10.30 2.16 340 Oct 15
Live births in Indiana 698,390 11 0.60 0.017 58,417.00 505.10 226 29-July

VD vaginal delivery, CS cesarean section, M mesor, A amplitude, ϕ acrophase, Month acrophase of cosinor analysis converted to month