142 Chapter 6 Findings Evaluation of the content validity of the BBS Content validity was determined by the examination of the BBS by an expert panel consisting of researchers (n=2), community midwives (n=3), hospitalbased midwives (n=2), obstetrician (n=1), midwifery lecturer (n=1), and student midwife (n=1) (15). The content validity per item (I-CVI) and the scale validity (S-CVI) were calculated based on the scores of the experts. The calculated I-CVI score was 0.78 or higher for all items except item 6 (I-CVI = 0.30). Scale validity can be calculated in two different ways: 1) count how many of the same items scored a 3 or more from the different experts, and divide this by the total number of items; 2) count for each item how many experts give an item a score of 3 or more. Add these totals and divide by the number of items rated (= number of experts * number of items). A good score for the S-CVI should be 0.90 or higher. The S-CVI calculated using method 1 was 0.91, while the S-CVI calculated using method 2 was 0.86. Based on the S-CVI score of 0.86, which is <0.90, adjusting item 6 would improve the I-CVI for this item and the S-CVI. Therefore, item 6 was adjusted before the questionnaire was distributed. Basic characteristics The questionnaire was completed by 199 maternity care professionals (Table 1). The response rate varied from 45 to 75% between the different MCNs. A total of 97 community midwives, 48 hospital-based midwives, and 54 obstetricians completed the questionnaire. The majority of the professionals were female (n=187, 94.0%), with a higher proportion of male professionals in the obstetrician group (16.7%). The mean number of years of work experience was comparable in the different groups (14,5 years, SD 9.1). Overall, 15.6% of the professionals was trained abroad. In the group of hospital-based midwives, a higher percentage of professionals was trained abroad, mostly in Belgium (37.5%).
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