condition mean min max ZT0-3 1.171165 1.171165 1.171165 ZT4-7 1.483695 1.483695 1.483695 ZT8-11 2.060575 2.060575 2.060575 ZT12-15 1.994045 1.994045 1.994045 ZT16-19 2.43542 2.43542 2.43542 ZT20-23 2.40468 2.40468 2.40468