143 Validation of the Birth Beliefs Scale for maternity care professionals in the Netherlands Table 1. Basic characteristics maternity care professionals (n=119) All professionals (n=199) Community midwives (n=97) Hospital-based midwives (n=48) Obstetricians (n=54) Gender - male (n, %) - female (n, %) - unknown (n, %) 11 (5.5%) 187 (94.0%) 1 (0.5%) 1 (1.0%) 96 (99.0%) 0 (0.0%) 1 (2.1%) 46 (95.8%) 1 (2.1%) 9 (16.7%) 45 (83.3%) 0 (0.0%) Work experience (years) – mean (SD) 14,5 (9.1) 14,6 (9.8) 14,9 (8.8) 14,05 (8.0) Education - the Netherlands (n, %) - Abroad (n, %) 168 (84.4%) 31 (15.6%) 84 (86.6%) 13 (13.4%) 30 (62.5%) 18 (37.5%) 54 (100%) 0 (0%) MCN high % IOL (n, %) MCN low % IOL (n, %) 84 (57.8%) 115 (42.2%) 37 (38.1%) 60 (61.9%) 17 (35.4%) 31 (64.6%) 30 (55.6%) 24 (44.4%) Evaluation of the internal reliability of the BSS Internal consistency was analysed for each of the BBS subscales (Table 2). Cronbach’s α for the BBS-Med was 0.74 and for the BBS-Nat 0.76. All item-tototal correlations were greater than 0.38, indicating a good internal reliability of the BBS for maternity care professionals. Table 2. Internal consistency for the BBS subscales N=199 BBS-Med Cronbach’s α Item-to-total correlation α = 0.74 r’s = .51-.83 BBS-Nat Cronbach’s α Item-to-total correlation α = 0.76 r’s = .63-.77 Evaluation of known-group discriminant validity of the BBS Table 3 shows the BBS scores by discipline. The mean score for the BBS-Med subscale was 2.72 (SD 0.63). On this subscale obstetricians had the highest score (M 3.22, SD 0.52), followed by hospital-based midwives (M 2.92, SD 0.53), and community midwives had the lowest score (M 2.72, SD 0.63). For the BBS-Nat subscale, the mean score was 3.89 (SD 0.60), with an inverse scoring pattern. The group of community midwives had the highest scores (M 4.24, SD 0.39), followed by hospital-based midwives (M 3.94, SD 0.46), and obstetricians had the lowest scores (M 3.21, SD 0.42). Each discipline showed variation in scores on both subscales, but we saw no outliers for any discipline. 6
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