condition mean min max ZT0-3 4.25680251625 3.4988206235 5.014784409 ZT4-7 3.1824510385 2.8159282589999997 3.548973818 ZT8-11 4.186429241 3.295831147 5.077027335 ZT12-15 6.96649717975 5.454401969999999 8.478592389500001 ZT16-19 5.783682431 5.5938917964999995 5.9734730655 ZT20-23 6.8628596135 6.599077896000001 7.126641331