condition mean min max ZT0-3 492.95366666666666 431.34299999999996 575.018 ZT4-7 480.954 480.954 480.954 ZT8-11 428.54150000000004 428.54150000000004 428.54150000000004 ZT12-15 423.06525 400.048 446.0825 ZT16-19 466.71299999999997 466.71299999999997 466.71299999999997 ZT20-23 325.243 325.243 325.243