condition mean min max ZT0-3 0.0713821 0.0713821 0.0713821 ZT4-7 0.02177165 0.02177165 0.02177165 ZT8-11 0.03527875 0.03527875 0.03527875 ZT12-15 0.02857605 0.02857605 0.02857605 ZT16-19 0.01882985 0.01882985 0.01882985 ZT20-23 0.05628455 0.05628455 0.05628455