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Table 2 Comparing observed and expected number of STI reported confirmed cases during the different study periodsa in Catalonia, August 1st 2017 to August 1st 2020

From: The impact of the COVID-19 pandemic on Sexually Transmitted Infections surveillance data: incidence drop or artefact?

  Periods observed expected upper CIb lower CIb difference upper CIb lower CIb
All STIs Pre-lockdown 41,814          
Lockdown 997 2264 2681 1846 − 1267 −56% − 1684 −63% − 849 −46%
De-escalation 1266 2546 3078 2015 − 1280 −50% − 1812 −59% − 749 −37%
New Normality 1116 2026 2446 1606 − 910 −45% − 1330 −54% − 490 −30%
Total 3379 6836 8205 5467 − 3457 −51% − 4826 −59% − 2088 −38%
Chlamydia Pre-lockdown 21,463          
Lockdown 472 1607 1731 1483 −1135 −71% − 1259 −73% − 1011 −68%
De-escalation 611 2376 2535 2216 − 1765 −74% − 1924 −76% − 1605 −72%
New Normality 549 1870 1997 1743 − 1321 −71% − 1448 −73% − 1194 −68%
Total 1632 5853 6264 5442 − 4221 −72% − 4632 −74% − 3810 −70%
Gonorrhoea Pre-lockdown 13,340          
Lockdown 329 747 889 605 −418 −56% −560 −63% −276 −46%
De-escalation 398 857 1037 678 − 459 −54% − 639 −62% −280 −41%
New Normality 339 670 812 529 − 331 −49% − 473 − 58% −190 −36%
Total 1066 2275 2738 1812 − 1209 −53% − 1672 −61% − 746 − 41%
Syphilis Pre-lockdown 6276          
Lockdown 168 250 337 164 −82 −33% − 169 −50% 4 2%
De-escalation 228 284 392 177 −56 −20% − 164 −42% 51 29%
New Normality 193 218 302 134 −25 −11% −109 −36% 59 44%
Total 589 753 1030 475 −164 −22% − 441 −43% 114 24%
LGVc Pre-lockdown 723          
Lockdown 28 54 62 47 −26 −48% −34 −55% −19 −40%
De-escalation 29 80 89 71 −51 −64% −60 −67% −42 −59%
New Normality 35 56 63 49 −21 −38% −28 −45% −14 −29%
Total 92 191 214 167 −99 −52% − 122 −57% −75 −45%
  1. aPre-lockdown: from August 1st 2017 to March 12th 2020, lockdown: from March 13th 2020 to April 27th2020, de-escalation phases: from April 28th 2020 to June 21st 2020, new normality: from June 22nd 2020 to August 1st 2020; bCI, confidence interval; cLGV, lymphogranuloma venereum