condition mean min max ZT0-3 9.698333 9.698333 9.698333 ZT4-7 11.076955000000002 11.076955000000002 11.076955000000002 ZT8-11 9.907023500000001 9.907023500000001 9.907023500000001 ZT12-15 10.166319999999999 10.166319999999999 10.166319999999999 ZT16-19 10.778915000000001 10.778915000000001 10.778915000000001 ZT20-23 9.882399 9.882399 9.882399