condition mean min max ZT0-3 3.78493923 3.106967837 4.462910623 ZT4-7 3.0733946867499995 3.0314038959999996 3.1153854775 ZT8-11 4.1491634105 3.8537592085 4.4445676125 ZT12-15 3.9106359837499998 3.6698120125 4.151459955 ZT16-19 3.3740786995 3.067471023 3.6806863759999997 ZT20-23 2.3896273087499997 1.6821929215 3.097061696