condition mean min max ZT0-3 2.15555950875 1.9033974885 2.4077215290000002 ZT4-7 1.7234384517499999 1.4339595255 2.012917378 ZT8-11 3.6502978187500004 2.5864482755000004 4.714147362 ZT12-15 7.4755484677499995 5.844624454 9.106472481499999 ZT16-19 5.615425988749999 5.4777205265 5.753131451 ZT20-23 6.588447807 6.570730441 6.606165173