condition mean min max ZT0-3 8.774775 7.25496 10.29459 ZT4-7 4.519019999999999 4.519019999999999 4.519019999999999 ZT8-11 4.27132 4.27132 4.27132 ZT12-15 0 0 0 ZT16-19 6.99482 6.99482 6.99482 ZT20-23 6.11 6.11 6.11