condition mean min max ZT0-3 0.8386 0.8386 0.8386 ZT4-7 0.7223124999999999 0.7223124999999999 0.7223124999999999 ZT8-11 0.48621949999999997 0.48621949999999997 0.48621949999999997 ZT12-15 0.599305 0.599305 0.599305 ZT16-19 0.7546203333333333 0.7546203333333333 0.7546203333333333 ZT20-23 1.047393 1.047393 1.047393