condition mean min max ZT0-3 5.8526425 5.52999 6.175295 ZT4-7 39.05175 39.05175 39.05175 ZT8-11 9.047975000000001 9.047975000000001 9.047975000000001 ZT12-15 0 0 0 ZT16-19 4.0212 4.0212 4.0212 ZT20-23 5.936375 5.936375 5.936375