condition mean min max ZT0-3 1.950625 1.950625 1.950625 ZT4-7 1.22057 1.22057 1.22057 ZT8-11 1.11844 1.11844 1.11844 ZT12-15 1.509805 1.509805 1.509805 ZT16-19 2.1315299999999997 2.1315299999999997 2.1315299999999997 ZT20-23 2.603295 2.603295 2.603295