condition mean min max ZT0-3 3.6514693912500005 1.7677020905 5.535236692000001 ZT4-7 1.101741314 0.8819151595 1.3215674685 ZT8-11 2.6902625555000004 1.2609771054999999 4.1195480055 ZT12-15 9.988903221 9.942432479499999 10.0353739625 ZT16-19 5.685668025 4.914399067 6.456936983 ZT20-23 2.0650468155 1.356385184 2.773708447