condition mean min max ZT0-3 0.17646450225000002 0.074731054 0.2781979505 ZT4-7 1.1379186195000002 0.8929276155000001 1.3829096235000002 ZT8-11 1.2484798072499999 1.162587656 1.3343719585 ZT12-15 2.433092503 1.7483621830000002 3.117822823 ZT16-19 1.9719250935000001 1.7460585800000001 2.197791607 ZT20-23 2.8878987620000003 2.7967310000000003 2.9790665240000003