condition mean min max ZT0-3 0.320129 0.320129 0.320129 ZT4-7 0.176188 0.176188 0.176188 ZT8-11 0.355955 0.355955 0.355955 ZT12-15 0.48694099999999996 0.48694099999999996 0.48694099999999996 ZT16-19 0.7284999999999999 0.7284999999999999 0.7284999999999999 ZT20-23 0.2948415 0.2948415 0.2948415