condition mean min max ZT0-3 0.19633250000000002 0.19633250000000002 0.19633250000000002 ZT4-7 0.137438 0.137438 0.137438 ZT8-11 0.41937749999999996 0.41937749999999996 0.41937749999999996 ZT12-15 0.6632445 0.6632445 0.6632445 ZT16-19 0.3429049 0.3429049 0.3429049 ZT20-23 0.3713115 0.3713115 0.3713115