condition mean min max ZT0-3 3775.573554 3775.573554 3775.573554 ZT4-7 5266.971603 5266.971603 5266.971603 ZT8-11 4668.472314000001 4668.472314000001 4668.472314000001 ZT12-15 4259.6734895 4259.6734895 4259.6734895 ZT16-19 3055.6025419999996 3055.6025419999996 3055.6025419999996 ZT20-23 2459.4723295000003 2459.4723295000003 2459.4723295000003