condition mean min max ZT0-3 7.163 7.163 7.163 ZT4-7 2.47301 2.47301 2.47301 ZT8-11 5.4088 5.4088 5.4088 ZT12-15 4.932335 4.932335 4.932335 ZT16-19 12.995625 12.995625 12.995625 ZT20-23 12.886375000000001 12.886375000000001 12.886375000000001