Table 1.

Sociodemographic characteristics and prevalence of multimorbidity and complex multimorbidity of pregnant women

	Total cohort n (column %)	Non-MM n [row % (CI)]	MM (2 +) n [row % (CI)]	cMM (4 +) n [row % (CI)]
Total	27771(100)	23105 [83.2(82.8–83.6)]	4666 [16.8(16.4–17.2)]	988 [3.6(3.3–3.8)]
Age at conception (years)
15–19	1779(6.4)	1597 [89.8(88.4–91.2)]	182 [10.2(8.8–11.6)]	21 [1.2(0.7–1.7)]
20–24	5048(18.2)	4161 [82.4(81.4–83.5)]	887 [17.6(16.5–18.6)]	160 [3.2(2.7–3.7)]
25–29	8288(29.8)	6877[83.0(82.2–83.8)]	1411 [17(16.2–17.8)]	275 [3.3(2.9–3.7)]
30–34	8000(28.8)	6699[83.7(82.9–84.5)]	1301[16.3(15.5–17.1)]	289 [3.6(3.2–4.0)]
35–39	3881(14)	3161[81.4(80.2–82.7)]	720[18.6(17.3–19.8)]	208 [5.4(4.7–6.1)]
40–44	725(2.6)	570[78.6(75.6–81.6)]	155[21.4(18.4–24.4)]	34 [4.7(3.2–6.2)]
45–49	50(0.2)	40[80.0(68.9–91.1)]	10[20.0(8.9–31.1)]	< 5
Previous live birth
0	11269 (40.6)	9668 [85.8(85.1–86.4)]	1601[14.2(13.6–14.9)]	300 [2.7(2.4–3.0)]
1	10091 (36.3)	8538[84.6(83.9–85.3)]	1553 [15.4(14.7–16.1)]	330 [3.3(2.9–3.6)]
2	3693 (13.3)	2863 [77.5(76.2–78.9)]	830 [22.5(21.1–23.8)]	184 [5.0(4.3–5.7)]
3	1382 (5)	1048 [75.8(73.6–78.1)]	334 [24.2(21.9–26.4)]	94 [6.8(5.5–8.1)]
4	403 (1.5)	287 [71.2(66.8–75.6)]	116 [28.8(24.4–33.2)]	28 [6.9(4.5–9.4)]
5 +	272 (1)	192 [70.6(65.2–76.0)]	80.0 [29.4(24.0–34.8)]	16 [5.9(3.1–8.7)]
Missing	661 (2.4)	509 [77.0(73.8–80.2)]	152 [23.0(19.8–26.2)]	36 [5.4(3.7–7.2)]
Previous pregnancies
0	8531(30.7)	7370 [86.4(85.7–87.1)]	1161[13.6(12.9–14.3)]	210 [2.5(2.1–2.8)]
1	8926 (32.1)	7704 [86.3(85.6–87)]	1222 [13.7(13.0–14.4)]	236 [2.6(2.3–3.0)]
2	4956 (17.9)	4068 [82.1(81–83.2)]	888 [17.9(16.8–19.0)]	193 [3.9(3.4–4.4)]
3	2622 (9.4)	2049[78.1(76.6–79.7)]	573 [21.9(20.3–23.4)]	134 [5.1(4.3–6.0)]
4	1329 (4.8)	973 [73.2(70.8–75.6)]	356 [26.8(24.4–29.2)]	94 [7.1(5.7–8.5)]
5	701(2.5)	477 [68.0(64.6–71.5)]	224 [32.0(28.5–35.4)]	51 [7.3(5.4–9.2)]
6 +	685 (2.5)	446 [65.1(61.5–68.7)]	239 [34.9(31.3–38.5)]	70 [10.2(8.0–12.5)]
Missing	21 (0.1)	18 [85.7(70.7–100.7)]	< 5	< 5
Ethnicity
White	20836 (75)	17375 [83.4(82.9–83.9)]	3461 [16.6(16.1–17.1)]	722 [3.5(3.2–3.7)]
Mixed race	43 (0.2)	39 [90.7(82–99.4)]	< 5	< 5
Black	140 (0.5)	131 [93.6(89.5–97.6)]	9 [6.4(2.4–10.5)]	< 5
Asian	570 (2.1)	529 [92.8(90.7–94.9)]	41 [7.2(5.1–9.3)]	8 [1.4(0.4–2.4)]
Others	411 (1.5)	343[83.5(79.9–87)]	68 [16.5(13–20.1)]	17 [4.1(2.2–6.1)]
Missing	5771(20.8)	4688 [81.2(80.2–82.2)]	1083 [18.8(17.8–19.8)]	240 [4.2(3.6–4.7)]
Deprivation (SIMD)
Most deprived	6056 (21.8)	4806 [79.4(78.3–80.4)]	1250 [20.6(19.6–21.7)]	293 [4.8(4.3–5.4)]
2	5382 (19.4)	4318 [80.2(79.2–81.3)]	1064 [19.8(18.7–20.8)]	259 [4.8(4.2–5.4)]
3	4653 (16.8)	3894 [83.7(82.6–84.7)]	759[16.3(15.3–17.4)]	150 [3.2(2.7–3.7)]
4	4883 (17.6)	4248 [87(86.1–87.9)]	635 [13(12.1–13.9)]	119 [2.4(2–2.9)]
Least Deprived	3441(12.4)	3024 [87.9(86.8–89)]	417 [12.1(11–13.2)]	69 [2(1.5–2.5)]
Missing	3356 (12.1)	2815 [83.9(82.6–85.1)]	541 [16.1(14.9–17.4)]	98 [2.9(2.4–3.5)]
BMI
Underweight (< 18.5)	583 (2.1)	500 [85.8(82.9–88.6)]	83 [14.2(11.4–17.1)]	11 [1.9(0.8–3.0)]
Normal Weight (18.5–24.9)	9940 (35.8)	8603 [86.5(85.9–87.2)]	1337 [13.5(12.8–14.1)]	250 [2.5(2.2–2.8)]
Overweight (25–29.9)	6036 (21.7)	5117 [84.8(83.9–85.7)]	919 [15.2(14.3–16.1)]	173 [2.9(2.4–3.3)]
Obese (> 30)	5383 (19.4)	4262 [79.2(78.1–80.3)]	1121 [20.8(19.7–21.9)]	259 [4.8(4.2–5.4)]
Missing	5829 (21)	4623 [79.3(78.3–80.4)]	1206 [20.7(19.6–21.7)]	295 [5.1(4.5–5.6)]
Smoking History
Never smoked	16619 (59.8)	14429 [86.8(86.3–87.3)]	2190 [13.2(12.7–13.7)]	397 [2.4(2.2–2.6)]
Current smoker	5373 (19.4)	3956 [73.6(72.4–74.8)]	1417 [26.4(25.2–27.6)]	356 [6.6(6.0–7.3)]
Former smoker	3579 (12.9)	2912 [81.4(80.1–82.6)]	667 [18.6(17.4–19.9)]	139 [3.9(3.3–4.5)]
Not known	2200 (7.9)	1808 [82.2(80.6–83.8)]	392 [17.8(16.2–19.4)]	96 [4.4(3.5–5.2)]

MM Multimorbidity, cMM Complex multimorbidity, SIMD Scottish Index of Multiple Deprivation, BMI Body Mass Index