condition mean min max ZT0-3 2.74916 2.171025 3.327295 ZT4-7 3.620205 3.620205 3.620205 ZT8-11 7.450335000000001 7.450335000000001 7.450335000000001 ZT12-15 0 0 0 ZT16-19 5.886795 5.886795 5.886795 ZT20-23 4.8483350000000005 4.8483350000000005 4.8483350000000005