Table 4.

Crude (PR) and adjusted (APR) estimated risks of potentially life-threatening condition (PLTC) and of less severe maternal morbidity (LSMM) according to some maternal and obstetric characteristics. CLAP 2009–2012.

Characteristics	No morbidity	PLTC	PR (95% CI)	APR (95% CI)	LSMM	PR (95% CI)	APR (95% CI)
Maternal age (years)a
10–19	108,907	25468	1.03 [0.92–1.15]	1.05 [0.93–1.19]	35482	1.04 [0.97–1.11]	1.10 [1.02–1.18]
20–24	128,968	29098	Ref.	Ref.	40029	Ref.	Ref.
25–29	96,493	24018	1.08 [1.00–1.18]	1.05 [1.02–1.08]	28105	0.95 [0.85–1.07]	0.93 [0.89–0.97]
30–34	64,458	18924	1.23 [1.06–1.43]	1.12 [1.05–1.18]	19737	0.99 [0.89–1.10]	0.92 [0.85–0.99]
35–55	40,585	12150	1.25 [1.11–1.42]	1.18 [1.10–1.26]	13714	1.07 [0.94–1.21]	1.00 [0.95–1.06]
Ethnicity/skin colourb
White	91,116	48,646	Ref.	Ref.	38,882	Ref.	Ref.
Mixed	298,612	48,499	0.40 [0.17–0.94]	0.44 [0.19–1.01]	75,497	0.67 [0.40–1.15]	0.57 [0.41–0.78]
Others	19,328	5,790	0.66 [0.39–1.12]	0.83 [0.54–1.27]	15,303	1.48 [0.97–2.25]	0.99 [0.67–1.47]
Literacyc
No or primary	203,185	40,699	0.71 [0.50–1.02]	0.83 [0.74–0.94]	48,548	0.69 [0.45–1.05]	0.90 [0.74–1.09]
Secondary or university	217,307	66,638	Ref.	Ref.	84,547	Ref.	Ref.
Marital statusd
Married + stable part	364,380	89,465	Ref.	Ref.	110,699	Ref.	Ref.
Single + other	56,037	17,616	1.21 [0.99–1.48]	1.04 [0.93–1.15]	22,171	1.22 [0.97–1.53]	1.10 [1.00–1.22]
Paritye
Nullipara	153,659	43,923	1.20 [1.09–1.33]	1.14 [1.06–1.23]	56,559	1.16 [1.04–1.30]	0.95 [0.80–1.13]
Multipara	250,299	56,737	Ref.	Ref.	75,554	Ref.	Ref.
Any previous conditionf
Yes	14,493	8,723	1.93 [1.29–2.90]	1.43 [1.09–1.87]	8,834	2.36 [1.55–3.58]	1.52 [1.35–1.72]
No	398,396	96,144	Ref.	Ref.	76,313	Ref.	Ref.
Number of prenatal care visitsg
0	30,445	6,820	0.78 [0.31–1.99]	0.99 [0.66–1.50]	9,831	0.95 [0.56–1.60]	0.76 [0.61–0.95]
1–4	115,059	22,285	0.69 [0.39–1.22]	0.87 [0.73–1.02]	35,221	0.91 [0.71–1.17]	0.92 [0.79–1.06]
>4	252,273	77,050	Ref.	Ref.	87,566	Ref.	Ref.
Smoking, drugs, alcohol, or violenceh
Yes	30,559	17,576	1.76 [0.84–3.72]	1.01 [0.89–1.14]	14,097	2.19 [1.37–3.50]	1.28 [1.15–1.42]
No	288,779	75,450	Ref.	Ref.	48,689	Ref.	Ref.
Previous C-sectioni
Yes	50,662	8,748	0.68 [0.57–0.82]	0.76 [0.68–0.85]	19,847	1.09 [0.97–1.21]	0.89 [0.80–1.00]
No	303,471	83,961	Ref.	Ref.	106,305	Ref.	Ref.
Onset of labourj
Spontaneous	340,966	87,326	Ref.	Ref.	97,812	Ref.	Ref.
Induced	20,578	10,826	1.69 [1.34–2.13]	1.13 [0.87–1.47]	9,894	1.46 [1.25–1.69]	1.39 [1.12–1.73]
Elective C-section	50,673	9,082	0.75 [0.47–1.18]	0.66 [0.46–0.94]	24,656	1.47 [1.16–1.86]	1.33 [1.12–1.58]
Mode of deliveryk
C-section	123,423	27,657	0.88 [0.66–1.18]	0.83 [0.68–1.02]	50,768	1.35 [1.12–1.62]	1.16 [1.05–1.28]
Vaginal (any)	310,183	81,745	Ref.	Ref.	85,770	Ref.	Ref.
Total	441,441	110,038			137,589

Missing information for a: 0.4%; b: 6.9%; c: 4.1%; d: 4.2%; e: 7.6%; f: 12.4%; g: 7.6%; h: 31.1%; i: 16.8%; j: 5.4%; k: 1.4% of cases; APR: adjusted prevalence ratio (adjusted for cluster effect and all other predictors); LSMM: less severe maternal morbidity; PLTC: potentially life-threatening condition.