condition mean min max ZT0-3 134.2374681575 127.06401411499999 141.4109222 ZT4-7 54.18195499 46.662895675 61.701014305 ZT8-11 44.9598888875 42.202744105 47.71703367 ZT12-15 48.7127944975 47.68655544 49.739033555 ZT16-19 81.0054213625 75.442393565 86.56844916 ZT20-23 145.47962617500002 125.67625275 165.2829996