condition mean min max ZT0-3 5.5215725 4.54555 6.4975950000000005 ZT4-7 10.13204 10.13204 10.13204 ZT8-11 5.710765 5.710765 5.710765 ZT12-15 0 0 0 ZT16-19 9.532315 9.532315 9.532315 ZT20-23 9.52685 9.52685 9.52685