Descriptive Analysis Results
Survey Participation
PLM members (n = 294,795) were invited to participate in the survey. Of these members, 21,923 viewed the invitation and 6872 patients electronically consented to participate in the survey; 15,501 did not respond or opted out. Among consented patients, 1535 were excluded box (duplicates = 3, asked to be removed after consent n = 1, and did not meet eligibility criteria = 1531). Of the remaining 5337 participants, 3988 completed the survey; 1349 abandoned the survey after starting.
Response Rate
The view rate (views/invites), participation rate (participants/views) and completion rate (completers/participants) were 7, 24, and 75 %, respectively. The completion rate was higher (75 vs. 60 %) than Internet surveys of similar length [19]. Figure 1 represents the flow of participants through the study. Eligible participants who completed the survey (n = 3988) were included in the final analyses sample.
Using available data (all participants may not have complete demographic data), comparisons of completers and non-completers indicated that the former were slightly older than the latter (mean 52.5 vs. 51.2 years, t = 3.2, p = 0.001) and completers reported more chronic conditions on their PLM profile (median 2 vs. 1, z = 10.4, p < 0.0001). Of note, completers were more likely to be White, more educated, medically unable to work, have health insurance, and reside in the US (see Table 1).
Table 1 Demographic characteristics of the study population
Demographic and Disease Characteristics
The mean age of the study sample at the time of the survey was 52.5 years (SD 12 years), with a median of two self-reported conditions listed on their PLM profile (interquartile range 1–4). The majority of participants were females (72 %, n = 2883), White (90 %, n = 3594), and attended college (82 %, n = 3279). Most participants had health insurance (90 %, n = 3602) but more than one-third of patients (37 %, n = 1464) were medically unable to work. The most prevalent primary conditions were fibromyalgia (20 %, n = 814), multiple sclerosis (19 %, n = 766), and Parkinson’s Disease (8 %, n = 319). More than three-quarters (77 %, n = 3094) of patients were affected ‘often’ to ‘always’ in their activities of daily living due to their condition. Participants reported high levels of prediagnosis healthcare involvement, with 87 % (n = 3504) citing that it was somewhat or very important to them to be involved in making decisions about their health prior to diagnosis (see Table 1 for more information).
Compared with the US Department of Health and Human Services statistics on chronic disease populations, our study sample underrepresents the most prevalent chronic conditions (e.g. cardiometabolic and respiratory diseases), ethnic minorities and older patients, and overrepresents debilitating neurological and movement disorders (fibromyalgia, multiple sclerosis, Parkinson’s disease), females, and more educated and insured participants [20]. The proportion of females in this sample may be partially explained by the gender distribution of fibromyalgia (80–90 % females) [21] and multiple sclerosis (as high as 3:1 to 4:1 females) [22]. Finally, multiple sclerosis and Parkinson’s disease are less common in minority populations [22, 23].
Health Information Seeking and Interactions
Our study sample generally reported positive indicators of health education, as well as positive interactions with providers and peers. Knowledge-seeking behavior was reported to be high, with resources such as health websites (WebMD, MayoClinic, etc.), patientslikeme.com, books, magazines, and journals cited by 87 % (n = 3489), 60 % (n = 2411), 43 % (n = 1734), 40 % (n = 1598), and 36 % (n = 1431) of patients, respectively, as sources they use to learn about their condition. Patients sought educational resources for a variety of reasons, including (in descending order) learning about treatment options (83 %, n = 3315), course and progression of disease (76 %, n = 3050), signs and symptoms (68 %, n = 2720), cause of condition (51 %, n = 2029), initial diagnosis (50 %, n = 2001), and health monitoring (48 %, n = 1926). The majority of patients assessed health information verbally from providers (59 %, n = 2359), and many of them also accessed paper copies (43 %, n = 1714) and patient portals (43 %, n = 1711).
Interactions with Health Providers and Peers
Most patients reported positive impressions of their health interactions with their providers and peers. Sixty-four percent (n = 2633) agreed that they were content with access to healthcare services and approximately three-quarters (73 %, n = 2883) were satisfied with continued care from their provider and healthcare institution (73 %, n = 2879). Seventy-seven percent (n = 3061) were satisfied with their primary provider relationship, the majority of patients (79 %, n = 3147) agreed that they have a say in treatment decision making, and 73 % (n = 2888) reported satisfaction with the continued care from their provider. Despite these positive reactions, a sizable minority of patients did not feel that their treatment goals matched their providers’ plan (34 %, n = 1251) or that they spent an adequate amount of time with their main provider during visits (36 %, n = 1426). In addition, the percentage of positive responses (4 or 5 on the 5-point Likert scale) across primary conditions was lowest for the following two survey questions: (1) to what extent do you feel your main healthcare provider monitors your ongoing care (a great deal or quite a bit; 55 % across all conditions); and (2) I have as much support as I need from friends to help care for and manage my condition (strongly agree or agree; 47 % across all conditions).
Peer interactions were also noted among patients, with 74 % (n = 2943) citing enabling other patients (“I have shared my experience of managing my condition with other people”) and 69 % (n = 2739) learning from others (“Do you learn from the experiences of other members that are part of online communities like PatientsLikeMe?”).
Exploratory Factor Analysis
We assessed 26 survey items (see Online Resource 2) using EFA to examine common factors that measure the underlying construct of empowerment. Due to the non-normal distribution of data, we applied the principal axis factoring method, which is robust for non-normal data distributions. Sampling adequacy for EFA measured by Kaiser–Meyer–Olkin (KMO) revealed adequate sample size (KMO = 0.9). The optimum EFA solution had two factors with eigenvalues of 5.7 and 1.3 for the first and second factors, respectively, accounting for >60 % of the overall variance in the observed variables. Sixteen (n = 16) items loaded >0.4 on one of the two factors, with a few items loading on more than one factor (cross-loading) (Table 2; see Appendix 2 for all 26 items). Discriminant validity of the 16 items assessed by corrected item-to-total correlation (correlations between items and total domain score with the item excluded in the domain total) [24] showed one item on the second factor had poor discriminant validity (<0.4) and was removed. The final factor solution contained eight items on the first factor and seven on the second factor. After reviewing the items contained within each factor (domain), the factors were named according to what the common theme of items within each factor best represented, i.e. ‘Positive Patient–Provider Interaction’ and ‘Knowledge and Personal Control’. Internal consistency testing of the factors demonstrated acceptable Cronbach’s α for each domain (α > 0.79). The factor scores were used as composite measures of each domain and the sum of both factor scores was used as the ‘Total Empowerment Score’. A higher score indicates greater empowerment for Positive Patient–Provider Interaction (minimum 8, maximum 40), Knowledge and Personal Control (minimum 7, maximum 35), and Total Empowerment Score (minimum 15, maximum 75) domains.
Table 2 Exploratory factor analysis and internal consistency of the empowerment itemsa
Patient Empowerment and Patient Characteristics
Positive Patient–Provider Interaction scores varied by patient characteristics, including primary condition, age, gender, insurance status, and education. Mean scores were higher in males (males 32.5 vs. females 31.6), more educated (advanced education 32.7 vs. college 31.9 vs. high school or less 30.8), and older (with the exception of age category >75 years) patients, and lower in uninsured patients (uninsured 28.2 vs. insured 32.1) (Table 3). No significant difference was noted in the scores of patients by work status (medically unable to work vs. able to work). Furthermore, patients with myalgic encephalomyelitis/chronic fatigue syndrome (28.6), systemic lupus erythematosus (29.4), and fibromyalgia (29.7) reported significantly lower scores compared with the overall weighted mean (Fig. 2). Patients with neurological disorders, including Parkinson’s disease (33.5) and multiple sclerosis (33.1), reported significantly higher scores compared with the overall weighted mean.
Table 3 Mean empowerment scores (total and factor level) with 95 % CIs across sociodemographic strata
There were two particular items in this scale that revealed specific differences by conditions. In patients with amyotrophic lateral sclerosis, 86 % responded that they strongly agree or agree (compared with 73 % across all diseases) to the survey item: “I am well-informed about the available treatment options for my primary health condition”. For the same item, patients with Parkinson’s disease and multiple sclerosis also had a high percentage of agreement (84 and 85 %, respectively); however, the percentage agreement for patients with fibromyalgia (58 %) and chronic fatigue syndrome (59 %) was less for the same survey item (see Online Resource 3). Compared with the overall sample, a smaller percentage of fibromyalgia (63 %) and chronic fatigue syndrome (64 %) respondents positively endorsed “How much of the health information you received from healthcare providers during your visits was clear and easy to understand”.
Knowledge and Personal Control scores were higher in males (males 27.8 vs. females 26.4), more educated (advanced education 27.7 vs. college 26.6 vs. high school or less 26.2), and older patients, and lower in those uninsured (uninsured 24.9 vs. insured 26.9) and patients who were medically unable to work (medically unable to work 26.2 vs. able to work 27.1) (Table 3). Patients with major depressive disorder (24.5), myalgic encephalomyelitis/chronic fatigue syndrome (24.7), and fibromyalgia (24.8) reported significantly lower scores compared with the weighted sample mean (Fig. 2), while patients with neurological disorders, including amyotrophic lateral sclerosis (28.4), Parkinson’s disease (28.0), and multiple sclerosis (27.8) reported higher scores than overall weighted mean. As expected, Total Empowerment scores also differed by sociodemographic and primary conditions (Table 3).
Patient Empowerment and Healthcare Access
Satisfaction with healthcare access (sum score of a nine-item unidimensional construct) was also strongly correlated with empowerment scores (Total Empowerment Scorer = 0.7, p < 0.0001; Positive Patient–Provider Interaction, r = 0.7, p < 0.0001; Knowledge and Personal Control, r = 0.6, p < 0.0001; not shown in the tables).