condition mean min max ZT0-3 45.690202 45.690202 45.690202 ZT4-7 26.220616999999997 26.220616999999997 26.220616999999997 ZT8-11 20.0003415 20.0003415 20.0003415 ZT12-15 21.942589 21.942589 21.942589 ZT16-19 14.477079 14.477079 14.477079 ZT20-23 16.0444775 16.0444775 16.0444775