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Table 3 Concordance measures of ANC indicators from the ANC card and self-reported questionnaire information

From: Agreement of antenatal care indicators from self-reported questionnaire and the antenatal care card of women in the 2015 Pelotas birth cohort, Rio Grande do Sul, Brazil

 Concordance ANC card/Self-reportedDiscordance ANC card/Self-reported% Agreement (95% CI)Kappa (95% CI)P valueAgreement strength categoryaPABAK (95% CI)Agreement strength categorybP value
No/NoYes/YesYes/NoNo/Yes
Indicator% (n)% (n)% (n)% (n)
Report of the number of antenatal care visitsd (n = 3791)12.6 (479)70.1 (2657)1.0 (36)6.3 (619)82.72 (81.43–84.02)0.50 (0.47–0.53)<0.001moderate0.65 (0.63–0.68)substantial<0.001
Report of the last date of menstrual period (n = 3922)0.4 (16)72.2 (2832)0.5 (19)26.9 (1055)72.62 (71.22–74.01)0.01 (0.00–0.02)0.043slight0.45 (0.42–0.48)moderate<0.001
Clinical exams
 Weight measurement (n = 3922)0.0 (1)96.2 (3773)0.2 (7)3.6 (141)96.23 (95.63–96.82)0.01(−0.02–0.03)0.472slight0.92 (0.91–0.94)almost perfect<0.001
 Symphysis-fundal height measurement (n = 3922)0.2 (8)93.2 (3654)0.3 (11)6.4 (249)93.37 (92.59–94.15)0.05 (0.01–0.08)0.009slight0.87 (0.85–0.88)almost perfect<0.001
 Blood pressure measurement (n = 3923)0.0 (0)96.4 (3780)0.1 (2)3.6 (141)96.35 (95.77–96.94)c-0.00(−0.00–0.00)0.152poor0.96 (0.96–0.97)almost perfect<0.001
 Gynecological exam (n = 3922)10.5 (413)31.5 (1237)3.9 (154)54.0 (2118)42.07 (40.52–43.62)0.04 (0.02–0.05)<0.001slightc-0.16(−0.19- -0-13)poor<0.001
 Cervical cancer screening test (n = 3914)31.7 (1241)15.0 (587)3.8 (147)49.5 (1939)46.70 (45.14–48.27)0.09 (0.07–0.11)<0.001slightc-0.07(−0.09- -0.03)poor<0.001
 Dental exam (n = 3922)61.0 (2391)1.7 (67)3.0 (119)34.3 (1345)62.67 (61.16–64.19)0.00(−0.02–0.02)0.996slight0.25 (0.22–0.28)fair<0.001
 Breast exam (n = 3917)45.9 (1796)9.1 (357)7.7 (300)37.4 (1464)54.97 (53.41–56.53)0.05 (0.03–0.08)<0.001slight0.09 (0.07–0.13)slight<0.001
 Venereal disease research lab (VDRL) test (n = 3923)0.0 (1)91.1 (3573)0.2 (6)8.7 (343)91.10 (90.21–91.99)0.00(−0.01–0.01)0.68slight0.82 (0.80–0.84)almost perfect<0.001
Diseases during pregnancy
 Hypertension (n = 3922)74.0 (2903)0.7 (29)0.4 (15)24.9 (976)74.76 (73.40–76.12)0.03 (0.02–0.05)<0.001slight0.49 (0.47–0.52)moderate<0.001
 Anaemia (n = 3921)57.2 (2241)3.0 (118)0.5 (18)39.4 (1544)60.16 (58.63–61.70)0.07 (0.06–0.09)< 0.001slight0.20 (0.17–0.23)fair<0.001
 Diabetes (n = 3923)90.9 (3567)0.4 (16)0.2 (8)8.5 (332)91.33 (90.45–92.21)0.07 (0.04–0.11)<0.001slight0.82 (0.81–0.84)almost perfect0.001
 Urinary tract infection (n = 3917)47.6 (1866)25.2 (986)6.9 (269)20.3 (796)72.81 (71.41–74.21)0.41 (0.41–0.47)<0.001moderate0.46 (0.43–0.48)moderate<0.001
 Sexually transmitted diseases (n = 3919)96.3 (3774)0.1 (2)2.7 (107)0.9 (36)96.35 (95.76–96.95)0.02(−0.02–0.07)0.218slight0.93 (0.92–0.94)almost perfect<0.001
Vaccination-Supplements
 Tetanus toxoid vaccination (n = 3866)21.5 (831)39.1 (1513)14.5 (562)24.8 (960)60.63 (59.07–62.19)0.19 (0.17–0.22)<0.001slight0.21 (0.18–0.24)fair<0.001
 Hepatitis B vaccination (n = 3842)38.8 (1490)23.8 (913)9.9 (379)27.6 (1060)62.55 (60.99–64.10)0.26 (0.23–0.29)<0.001fair0.25 (0.22–0.28)fair<0.001
 Prescription of iron supplements (n = 3923)17.8 (697)22.1 (865)3.2 (126)57.0 (2235)39.82 (38.28–41.35)0.06 (0.05–0.08)<0.001slightc-0.20(−0.23- -0.17)poor<0.001
Counselling
 Risks of alcohol use during pregnancy (n = 3920)25.4 (994)0.8 (31)0.2 (7)73.7 (2888)26.15 (24.77–27.52)0.00(−0.00–0.01)0.263slightc-0.48(−0.50- -0.45)poor<0.001
 Risks of smoking during pregnancy (n = 3920)24.6 (965)1.0 (38)0.2 (8)74.2 (2909)25.59 (24.22–26.95)0.00(−0.00–0.01)0.189slightc-0.49(−0.52- -0.46)poor<0.001
 Physical exercises such as walking (n = 3921)38.0 (1489)0.0 (1)0.1 (2)62.0 (2429)38.00 (36.48–39.52)c-0.00(−0.00- -0.00)0.368poorc-0.24 (−0.27- -0.21)poor<0.001
  1. aAccording to Landis and Koch categorization as almost perfect (>0.80), substantial (0.61–0.80), moderate (0.41–0.60), fair (0.21–0.40), slight (0.00–0.20) and poor (<0.00)
  2. bStrength of agreement of coefficient PABAK according to Landis and Koch
  3. cnegative estimate
  4. d> =6 Visit