Development and validation of an obstetric early warning system model for use in low resource settings

Table 3 Odds ratios for SMO of the significant predictor variables

Parameters	Odds ratio*	S. E	Significance (p)	95% CI
Parameters	Odds ratio*	S. E	Significance (p)	Lower	Upper
Developmental model (n = 600; 200 cases versus 400 controls)
sBP > 140 mmHg	5·26	0·49	0·001	2·03	13·63
sBP < 90 mmHg	3·73	0·42	0·002	1·65	8·41
dBP > 90 mmHg	2·78	0·48	0·035	1·08	7·16
RR > 40 cycles/min.	25·20	0·92	< 0·001	4·19	51·60
Temp> 38 °C	116·51	1·12	< 0·001	12·96	147·42
PR > 120/min	4·62	0·43	< 0·001	2·00	10·66
CS (Yes vs No)	5·91	0·38	< 0·001	2·79	12·53
Number of CS	0·96	0·01	< 0·001	0·95	0·97
Validation model (n = 900); 300 cases versus 600 controls)
sBP > 140 mmHg	8.61	0·56	< 0·001	4·32	32·82
sBP < 90 mmHg	5.·42	0·33	0·002	2·66	7·35
dBP > 90 mmHg	2·80	0·45	0·119	0·65	8·70
Temp> 38 °C	123·21	2·95	0·002	62·83	136·95
RR > 40 cycles/min	18·21	2·40	< 0·001	3·43	24·31
CS (yes vs. no)	5·85	1·42	< 0·001	3·59	11·19
Number of CS	0·97	0·06	< 0·001	0·95	0·99
PR > 120/min	4·84	0·40	< 0·001	1·69	9·08
Performance checking model with total data set (n = 5243)
sBP > 140 mmHg	15·50	0·31	< 0·001	8·38	28·69
sBP < 90 mmHg	2·09	0·20	< 0·001	1·42	3·08
dBP > 90 mmHg	0·89	0·30	0·706	0·50	1·61
RR > 40 cycles/min	23·19	0·47	< 0·001	9·18	58·57
Temp > 38 °C	55·90	0·46	< 0·001	22·64	138·02
CS (yes vs no)	6·38	0·16	< 0·001	4·71	8·65
Number of CS	0·98	0·00	< 0·001	0·98	0·98
PR > 120	6·27	0·21	< 0·001	4·14	9·50

ISSN: 1471-2393