condition mean min max ZT0-3 4.926520030500001 4.127407392 5.725632669 ZT4-7 5.331010084500001 5.2025116115 5.4595085575 ZT8-11 5.64340863125 5.49156247 5.7952547925 ZT12-15 5.682310082000001 5.2260243895 6.138595774500001 ZT16-19 6.999712246750001 6.3122728405 7.687151653 ZT20-23 10.596795530500001 9.808341851000002 11.385249210000001